Apply single GUI style to all admin GUIs.

src/main/java/world/bentobox/challenges/panel/admin/AdminGUI.java

@@ -13,6 +13,7 @@ import world.bentobox.bentobox.api.panels.builders.PanelBuilder;
 import world.bentobox.bentobox.api.user.User;
 import world.bentobox.challenges.ChallengesAddon;
 import world.bentobox.challenges.panel.CommonGUI;
+import world.bentobox.challenges.utils.GuiUtils;
 
 
 /**
@@ -89,28 +90,31 @@ public class AdminGUI extends CommonGUI
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).name(
 			this.user.getTranslation("challenges.admin.gui-title"));
 
+		GuiUtils.fillBorder(panelBuilder);
 
-		panelBuilder.item(1, this.createButton(Button.COMPLETE_USER_CHALLENGES));
+		panelBuilder.item(10, this.createButton(Button.COMPLETE_USER_CHALLENGES));
-		panelBuilder.item(10, this.createButton(Button.RESET_USER_CHALLENGES));
+		panelBuilder.item(19, this.createButton(Button.RESET_USER_CHALLENGES));
 
 		// Add Challenges
-		panelBuilder.item(3, this.createButton(Button.ADD_CHALLENGE));
+		panelBuilder.item(12, this.createButton(Button.ADD_CHALLENGE));
-		panelBuilder.item(12, this.createButton(Button.ADD_LEVEL));
+		panelBuilder.item(13, this.createButton(Button.ADD_LEVEL));
 
 		// Edit Challenges
-		panelBuilder.item(4, this.createButton(Button.EDIT_CHALLENGE));
+		panelBuilder.item(21, this.createButton(Button.EDIT_CHALLENGE));
-		panelBuilder.item(13, this.createButton(Button.EDIT_LEVEL));
+		panelBuilder.item(22, this.createButton(Button.EDIT_LEVEL));
 
 		// Remove Challenges
-		panelBuilder.item(5, this.createButton(Button.DELETE_CHALLENGE));
+		panelBuilder.item(30, this.createButton(Button.DELETE_CHALLENGE));
-		panelBuilder.item(14, this.createButton(Button.DELETE_LEVEL));
+		panelBuilder.item(31, this.createButton(Button.DELETE_LEVEL));
 
 
 		// Import Challenges
-		panelBuilder.item(7, this.createButton(Button.IMPORT_CHALLENGES));
+		panelBuilder.item(15, this.createButton(Button.IMPORT_CHALLENGES));
 
 		// Edit Addon Settings
-		panelBuilder.item(8, this.createButton(Button.EDIT_SETTINGS));
+		panelBuilder.item(16, this.createButton(Button.EDIT_SETTINGS));
+
+		panelBuilder.item(44, this.returnButton);
 
 		panelBuilder.build();
 	}

src/main/java/world/bentobox/challenges/panel/admin/EditChallengeGUI.java

@@ -19,6 +19,7 @@ import world.bentobox.challenges.panel.util.ItemSwitchGUI;
 import world.bentobox.challenges.panel.util.NumberGUI;
 import world.bentobox.challenges.panel.util.SelectEnvironmentGUI;
 import world.bentobox.challenges.panel.util.StringListGUI;
+import world.bentobox.challenges.utils.GuiUtils;
 
 
 /**
@@ -81,6 +82,8 @@ public class EditChallengeGUI extends CommonGUI
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).name(
 			this.user.getTranslation("challenges.gui.admin.edit-challenge-title"));
 
+		GuiUtils.fillBorder(panelBuilder);
+
 		panelBuilder.item(2, this.createMenuButton(MenuType.PROPERTIES));
 		panelBuilder.item(4, this.createMenuButton(MenuType.REQUIREMENTS));
 		panelBuilder.item(6, this.createMenuButton(MenuType.REWARDS));
@@ -109,7 +112,7 @@ public class EditChallengeGUI extends CommonGUI
 			this.buildRewardsPanel(panelBuilder);
 		}
 
-		panelBuilder.item(53, this.returnButton);
+		panelBuilder.item(44, this.returnButton);
 
 		panelBuilder.build();
 	}
@@ -140,14 +143,14 @@ public class EditChallengeGUI extends CommonGUI
 	 */
 	private void buildIslandRequirementsPanel(PanelBuilder panelBuilder)
 	{
-		panelBuilder.item(10, this.createButton(Button.REQUIRED_ENTITIES));
+		panelBuilder.item(19, this.createButton(Button.REQUIRED_ENTITIES));
-		panelBuilder.item(11, this.createButton(Button.REMOVE_ENTITIES));
+		panelBuilder.item(28, this.createButton(Button.REMOVE_ENTITIES));
 
-		panelBuilder.item(15, this.createButton(Button.REQUIRED_BLOCKS));
+		panelBuilder.item(21, this.createButton(Button.REQUIRED_BLOCKS));
-		panelBuilder.item(16, this.createButton(Button.REMOVE_BLOCKS));
+		panelBuilder.item(29, this.createButton(Button.REMOVE_BLOCKS));
 
-		panelBuilder.item(19, this.createButton(Button.SEARCH_RADIUS));
+		panelBuilder.item(23, this.createButton(Button.SEARCH_RADIUS));
-		panelBuilder.item(28, this.createButton(Button.REQUIRED_PERMISSIONS));
+		panelBuilder.item(25, this.createButton(Button.REQUIRED_PERMISSIONS));
 	}
 
 
@@ -158,9 +161,9 @@ public class EditChallengeGUI extends CommonGUI
 	private void buildInventoryRequirementsPanel(PanelBuilder panelBuilder)
 	{
 		panelBuilder.item(10, this.createButton(Button.REQUIRED_ITEMS));
-		panelBuilder.item(11, this.createButton(Button.REMOVE_ITEMS));
+		panelBuilder.item(19, this.createButton(Button.REMOVE_ITEMS));
 
-		panelBuilder.item(28, this.createButton(Button.REQUIRED_PERMISSIONS));
+		panelBuilder.item(25, this.createButton(Button.REQUIRED_PERMISSIONS));
 	}
 
 
@@ -171,14 +174,14 @@ public class EditChallengeGUI extends CommonGUI
 	private void buildOtherRequirementsPanel(PanelBuilder panelBuilder)
 	{
 		panelBuilder.item(10, this.createButton(Button.REQUIRED_EXPERIENCE));
-		panelBuilder.item(11, this.createButton(Button.REMOVE_EXPERIENCE));
+		panelBuilder.item(19, this.createButton(Button.REMOVE_EXPERIENCE));
 
-		panelBuilder.item(13, this.createButton(Button.REQUIRED_LEVEL));
+		panelBuilder.item(12, this.createButton(Button.REQUIRED_MONEY));
+		panelBuilder.item(21, this.createButton(Button.REMOVE_MONEY));
 
-		panelBuilder.item(15, this.createButton(Button.REQUIRED_MONEY));
+		panelBuilder.item(23, this.createButton(Button.REQUIRED_LEVEL));
-		panelBuilder.item(16, this.createButton(Button.REMOVE_MONEY));
 
-		panelBuilder.item(28, this.createButton(Button.REQUIRED_PERMISSIONS));
+		panelBuilder.item(25, this.createButton(Button.REQUIRED_PERMISSIONS));
 	}
 
 
@@ -188,12 +191,12 @@ public class EditChallengeGUI extends CommonGUI
 	 */
 	private void buildRewardsPanel(PanelBuilder panelBuilder)
 	{
-		panelBuilder.item(11, this.createButton(Button.REWARD_TEXT));
+		panelBuilder.item(10, this.createButton(Button.REWARD_TEXT));
-		panelBuilder.item(20, this.createButton(Button.REWARD_ITEM));
+		panelBuilder.item(19, this.createButton(Button.REWARD_COMMANDS));
-		panelBuilder.item(29, this.createButton(Button.REWARD_EXPERIENCE));
-		panelBuilder.item(38, this.createButton(Button.REWARD_MONEY));
-		panelBuilder.item(47, this.createButton(Button.REWARD_COMMANDS));
 
+		panelBuilder.item(11, this.createButton(Button.REWARD_ITEM));
+		panelBuilder.item(20, this.createButton(Button.REWARD_EXPERIENCE));
+		panelBuilder.item(29, this.createButton(Button.REWARD_MONEY));
 
 		panelBuilder.item(22, this.createButton(Button.REPEATABLE));
 
@@ -202,10 +205,11 @@ public class EditChallengeGUI extends CommonGUI
 			panelBuilder.item(31, this.createButton(Button.REPEAT_COUNT));
 
 			panelBuilder.item(15, this.createButton(Button.REPEAT_REWARD_TEXT));
-			panelBuilder.item(24, this.createButton(Button.REPEAT_REWARD_ITEM));
+			panelBuilder.item(24, this.createButton(Button.REPEAT_REWARD_COMMANDS));
-			panelBuilder.item(33, this.createButton(Button.REPEAT_REWARD_EXPERIENCE));
+
-			panelBuilder.item(42, this.createButton(Button.REPEAT_REWARD_MONEY));
+			panelBuilder.item(16, this.createButton(Button.REPEAT_REWARD_ITEM));
-			panelBuilder.item(51, this.createButton(Button.REPEAT_REWARD_COMMANDS));
+			panelBuilder.item(25, this.createButton(Button.REPEAT_REWARD_EXPERIENCE));
+			panelBuilder.item(34, this.createButton(Button.REPEAT_REWARD_MONEY));
 		}
 	}
 

src/main/java/world/bentobox/challenges/panel/admin/EditLevelGUI.java

@@ -23,6 +23,7 @@ import world.bentobox.challenges.panel.util.ItemSwitchGUI;
 import world.bentobox.challenges.panel.util.NumberGUI;
 import world.bentobox.challenges.panel.util.SelectChallengeGUI;
 import world.bentobox.challenges.panel.util.StringListGUI;
+import world.bentobox.challenges.utils.GuiUtils;
 
 
 /**
@@ -82,6 +83,8 @@ public class EditLevelGUI extends CommonGUI
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).name(
 			this.user.getTranslation("challenges.gui.admin.edit-level-title"));
 
+		GuiUtils.fillBorder(panelBuilder);
+
 		panelBuilder.item(2, this.createMenuButton(MenuType.PROPERTIES));
 		panelBuilder.item(4, this.createMenuButton(MenuType.REWARDS));
 		panelBuilder.item(6, this.createMenuButton(MenuType.CHALLENGES));
@@ -99,7 +102,7 @@ public class EditLevelGUI extends CommonGUI
 			this.buildRewardsPanel(panelBuilder);
 		}
 
-		panelBuilder.item(53, this.returnButton);
+		panelBuilder.item(44, this.returnButton);
 
 		panelBuilder.build();
 	}
@@ -127,11 +130,12 @@ public class EditLevelGUI extends CommonGUI
 	 */
 	private void buildRewardsPanel(PanelBuilder panelBuilder)
 	{
-		panelBuilder.item(11, this.createButton(Button.REWARD_DESCRIPTION));
+		panelBuilder.item(12, this.createButton(Button.REWARD_DESCRIPTION));
-		panelBuilder.item(20, this.createButton(Button.REWARD_ITEM));
+		panelBuilder.item(21, this.createButton(Button.REWARD_COMMANDS));
-		panelBuilder.item(29, this.createButton(Button.REWARD_EXPERIENCE));
+
-		panelBuilder.item(38, this.createButton(Button.REWARD_MONEY));
+		panelBuilder.item(13, this.createButton(Button.REWARD_ITEM));
-		panelBuilder.item(47, this.createButton(Button.REWARD_COMMANDS));
+		panelBuilder.item(22, this.createButton(Button.REWARD_EXPERIENCE));
+		panelBuilder.item(31, this.createButton(Button.REWARD_MONEY));
 	}
 
 
@@ -141,39 +145,45 @@ public class EditLevelGUI extends CommonGUI
 	 */
 	private void buildChallengesPanel(PanelBuilder panelBuilder)
 	{
-		List<Challenges> challenges = this.addon.getChallengesManager().getChallenges(this.challengeLevel);
+		List<Challenges> challengeList = this.addon.getChallengesManager().getChallenges(this.challengeLevel);
+
+		final int MAX_ELEMENTS = 21;
 
 		if (this.pageIndex < 0)
+		{
+			this.pageIndex = challengeList.size() / MAX_ELEMENTS;
+		}
+		else if (this.pageIndex > (challengeList.size() / MAX_ELEMENTS))
 		{
 			this.pageIndex = 0;
 		}
-		else if (this.pageIndex > (challenges.size() / 18))
+
+		int challengeIndex = MAX_ELEMENTS * this.pageIndex;
+
+		// I want first row to be only for navigation and return button.
+		int index = 10;
+
+		while (challengeIndex < ((this.pageIndex + 1) * MAX_ELEMENTS) &&
+			challengeIndex < challengeList.size() &&
+			index < 36)
 		{
-			this.pageIndex = challenges.size() / 18;
+			if (!panelBuilder.slotOccupied(index))
+			{
+				panelBuilder.item(index, this.createChallengeIcon(challengeList.get(challengeIndex++)));
 			}
 
-		int challengeIndex = 18 * this.pageIndex;
+			index++;
-		int elementIndex = 9;
-
-		while (challengeIndex < ((this.pageIndex + 1) * 18) &&
-			challengeIndex < challenges.size())
-		{
-			panelBuilder.item(elementIndex++, this.createChallengeIcon(challenges.get(challengeIndex)));
-			challengeIndex++;
 		}
 
-		if (this.pageIndex > 0)
+		// Navigation buttons only if necessary
+		if (challengeList.size() > MAX_ELEMENTS)
 		{
-			panelBuilder.item(29, this.getButton(CommonButtons.PREVIOUS));
+			panelBuilder.item(18, this.getButton(CommonButtons.PREVIOUS));
+			panelBuilder.item(26, this.getButton(CommonButtons.NEXT));
 		}
 
-		if (challengeIndex < challenges.size())
+		panelBuilder.item(39, this.createButton(Button.ADD_CHALLENGE));
-		{
+		panelBuilder.item(41, this.createButton(Button.REMOVE_CHALLENGE));
-			panelBuilder.item(33, this.getButton(CommonButtons.NEXT));
-		}
-
-		panelBuilder.item(30, this.createButton(Button.ADD_CHALLENGE));
-		panelBuilder.item(32, this.createButton(Button.REMOVE_CHALLENGE));
 	}
 
 

src/main/java/world/bentobox/challenges/panel/admin/EditSettingsGUI.java

@@ -9,6 +9,7 @@ import world.bentobox.bentobox.api.panels.builders.PanelItemBuilder;
 import world.bentobox.bentobox.api.user.User;
 import world.bentobox.challenges.ChallengesAddon;
 import world.bentobox.challenges.panel.CommonGUI;
+import world.bentobox.challenges.utils.GuiUtils;
 
 
 /**
@@ -60,8 +61,10 @@ public class EditSettingsGUI extends CommonGUI
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).name(
 			this.user.getTranslation("challenges.gui.admin.settings-title"));
 
+		GuiUtils.fillBorder(panelBuilder);
+
 		// resetChallenges
-		panelBuilder.item(0, new PanelItemBuilder().
+		panelBuilder.item(19, new PanelItemBuilder().
 			name(this.user.getTranslation("challenges.gui.admin.buttons.reset")).
 			description(this.user.getTranslation("challenges.gui.admin.descriptions.reset")).
 			icon(Material.LAVA_BUCKET).
@@ -74,7 +77,7 @@ public class EditSettingsGUI extends CommonGUI
 			build());
 
 		// broadcastMessages
-		panelBuilder.item(1, new PanelItemBuilder().
+		panelBuilder.item(20, new PanelItemBuilder().
 			name(this.user.getTranslation("challenges.gui.admin.buttons.broadcast")).
 			description(this.user.getTranslation("challenges.gui.admin.descriptions.broadcast")).
 			icon(Material.JUKEBOX).
@@ -87,7 +90,7 @@ public class EditSettingsGUI extends CommonGUI
 			build());
 
 		// removeCompleteOneTimeChallenges
-		panelBuilder.item(2, new PanelItemBuilder().
+		panelBuilder.item(21, new PanelItemBuilder().
 			name(this.user.getTranslation("challenges.gui.admin.buttons.remove-on-complete")).
 			description(this.user.getTranslation("challenges.gui.admin.descriptions.remove-on-complete")).
 			icon(Material.MAGMA_BLOCK).
@@ -100,7 +103,7 @@ public class EditSettingsGUI extends CommonGUI
 			build());
 
 		// addCompletedGlow
-		panelBuilder.item(3, new PanelItemBuilder().
+		panelBuilder.item(22, new PanelItemBuilder().
 			name(this.user.getTranslation("challenges.gui.admin.buttons.glow")).
 			description(this.user.getTranslation("challenges.gui.admin.descriptions.glow")).
 			icon(Material.GLOWSTONE).
@@ -112,8 +115,21 @@ public class EditSettingsGUI extends CommonGUI
 			glow(this.addon.getChallengesSettings().isAddCompletedGlow()).
 			build());
 
+		// freeChallengesAtTheTop
+		panelBuilder.item(23, new PanelItemBuilder().
+			name(this.user.getTranslation("challenges.gui.admin.buttons.free-challenges")).
+			description(this.user.getTranslation("challenges.gui.admin.descriptions.free-challenges")).
+			icon(Material.FILLED_MAP).
+			clickHandler((panel, user1, clickType, i) -> {
+				this.addon.getChallengesSettings().setFreeChallengesFirst(
+					!this.addon.getChallengesSettings().isFreeChallengesFirst());
+				return true;
+			}).
+			glow(this.addon.getChallengesSettings().isFreeChallengesFirst()).
+			build());
+
 		// Return Button
-		panelBuilder.item(8, this.returnButton);
+		panelBuilder.item(44, this.returnButton);
 
 		panelBuilder.build();
 	}

src/main/java/world/bentobox/challenges/panel/admin/ListChallengesGUI.java

@@ -1,6 +1,7 @@
 package world.bentobox.challenges.panel.admin;
 
 
+import org.bukkit.Material;
 import org.bukkit.World;
 import java.util.List;
 
@@ -12,6 +13,7 @@ import world.bentobox.challenges.ChallengesAddon;
 import world.bentobox.challenges.database.object.Challenges;
 import world.bentobox.challenges.panel.CommonGUI;
 import world.bentobox.challenges.panel.util.ConfirmationGUI;
+import world.bentobox.challenges.utils.GuiUtils;
 
 
 /**
@@ -71,42 +73,53 @@ public class ListChallengesGUI extends CommonGUI
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).name(
 			this.user.getTranslation("challenges.gui.admin.choose-challenge-title"));
 
+		if (this.currentMode.equals(Mode.DELETE))
+		{
+			GuiUtils.fillBorder(panelBuilder, Material.RED_STAINED_GLASS_PANE);
+		}
+		else
+		{
+			GuiUtils.fillBorder(panelBuilder);
+		}
+
 		List<Challenges> challengeList = this.addon.getChallengesManager().getChallengesList();
 
-		int MAX_ELEMENTS = 45;
+		final int MAX_ELEMENTS = 21;
+
 		if (this.pageIndex < 0)
 		{
-			this.pageIndex = 0;
+			this.pageIndex = challengeList.size() / MAX_ELEMENTS;
 		}
 		else if (this.pageIndex > (challengeList.size() / MAX_ELEMENTS))
 		{
-			this.pageIndex = challengeList.size() / MAX_ELEMENTS;
+			this.pageIndex = 0;
 		}
 
 		int challengeIndex = MAX_ELEMENTS * this.pageIndex;
 
+		// I want first row to be only for navigation and return button.
+		int index = 10;
+
 		while (challengeIndex < ((this.pageIndex + 1) * MAX_ELEMENTS) &&
-			challengeIndex < challengeList.size())
+			challengeIndex < challengeList.size() &&
+			index < 36)
 		{
-			panelBuilder.item(this.createChallengeIcon(challengeList.get(challengeIndex)));
+			if (!panelBuilder.slotOccupied(index))
-			challengeIndex++;
+			{
+				panelBuilder.item(index, this.createChallengeIcon(challengeList.get(challengeIndex++)));
 			}
 
-		int nextIndex = challengeIndex % MAX_ELEMENTS == 0 ?
+			index++;
-			MAX_ELEMENTS :
-			(((challengeIndex % MAX_ELEMENTS) - 1) / 9 + 1) * 9;
-
-		if (challengeIndex > MAX_ELEMENTS)
-		{
-			panelBuilder.item(nextIndex + 2, this.getButton(CommonButtons.PREVIOUS));
 		}
 
-		if (challengeIndex < challengeList.size())
+		// Navigation buttons only if necessary
+		if (challengeList.size() > MAX_ELEMENTS)
 		{
-			panelBuilder.item(nextIndex + 6, this.getButton(CommonButtons.NEXT));
+			panelBuilder.item(18, this.getButton(CommonButtons.PREVIOUS));
+			panelBuilder.item(26, this.getButton(CommonButtons.NEXT));
 		}
 
-		panelBuilder.item(nextIndex + 8, this.returnButton);
+		panelBuilder.item(44, this.returnButton);
 
 		panelBuilder.build();
 	}

src/main/java/world/bentobox/challenges/panel/admin/ListLevelsGUI.java

@@ -1,6 +1,7 @@
 package world.bentobox.challenges.panel.admin;
 
 
+import org.bukkit.Material;
 import org.bukkit.World;
 import java.util.List;
 
@@ -12,6 +13,7 @@ import world.bentobox.challenges.ChallengesAddon;
 import world.bentobox.challenges.database.object.ChallengeLevels;
 import world.bentobox.challenges.panel.CommonGUI;
 import world.bentobox.challenges.panel.util.ConfirmationGUI;
+import world.bentobox.challenges.utils.GuiUtils;
 
 
 /**
@@ -71,42 +73,53 @@ public class ListLevelsGUI extends CommonGUI
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).name(
 			this.user.getTranslation("challenges.gui.admin.choose-level-title"));
 
+		if (this.currentMode.equals(Mode.DELETE))
+		{
+			GuiUtils.fillBorder(panelBuilder, Material.RED_STAINED_GLASS_PANE);
+		}
+		else
+		{
+			GuiUtils.fillBorder(panelBuilder);
+		}
+
 		List<ChallengeLevels> levelList = this.addon.getChallengesManager().getChallengeLevelList();
 
-		int MAX_ELEMENTS = 45;
+		final int MAX_ELEMENTS = 21;
+
 		if (this.pageIndex < 0)
 		{
-			this.pageIndex = 0;
+			this.pageIndex = levelList.size() / MAX_ELEMENTS;
 		}
 		else if (this.pageIndex > (levelList.size() / MAX_ELEMENTS))
 		{
-			this.pageIndex = levelList.size() / MAX_ELEMENTS;
+			this.pageIndex = 0;
 		}
 
 		int levelIndex = MAX_ELEMENTS * this.pageIndex;
 
+		// I want first row to be only for navigation and return button.
+		int index = 10;
+
 		while (levelIndex < ((this.pageIndex + 1) * MAX_ELEMENTS) &&
-			levelIndex < levelList.size())
+			levelIndex < levelList.size() &&
+			index < 36)
 		{
-			panelBuilder.item(this.createLevelIcon(levelList.get(levelIndex)));
+			if (!panelBuilder.slotOccupied(index))
-			levelIndex++;
+			{
+				panelBuilder.item(index, this.createLevelIcon(levelList.get(levelIndex++)));
 			}
 
-		int nextIndex = levelIndex % MAX_ELEMENTS == 0 ?
+			index++;
-			MAX_ELEMENTS :
-			(((levelIndex % MAX_ELEMENTS) - 1) / 9 + 1) * 9;
-
-		if (levelIndex > MAX_ELEMENTS)
-		{
-			panelBuilder.item(nextIndex + 2, this.getButton(CommonButtons.PREVIOUS));
 		}
 
-		if (levelIndex < levelList.size())
+		// Navigation buttons only if necessary
+		if (levelList.size() > MAX_ELEMENTS)
 		{
-			panelBuilder.item(nextIndex + 6, this.getButton(CommonButtons.NEXT));
+			panelBuilder.item(18, this.getButton(CommonButtons.PREVIOUS));
+			panelBuilder.item(26, this.getButton(CommonButtons.NEXT));
 		}
 
-		panelBuilder.item(nextIndex + 8, this.returnButton);
+		panelBuilder.item(44, this.returnButton);
 
 		panelBuilder.build();
 	}

src/main/java/world/bentobox/challenges/panel/admin/ListUsersGUI.java

@@ -18,6 +18,7 @@ import world.bentobox.challenges.ChallengesManager;
 import world.bentobox.challenges.panel.CommonGUI;
 import world.bentobox.challenges.panel.util.ConfirmationGUI;
 import world.bentobox.challenges.panel.util.SelectChallengeGUI;
+import world.bentobox.challenges.utils.GuiUtils;
 
 
 /**
@@ -50,7 +51,7 @@ public class ListUsersGUI extends CommonGUI
 	private enum ViewMode
 	{
 		ONLINE,
-		OFFLINE,
+		WITH_ISLAND,
 		IN_WORLD
 	}
 
@@ -114,45 +115,48 @@ public class ListUsersGUI extends CommonGUI
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).name(
 			this.user.getTranslation("challenges.gui.admin.choose-user-title"));
 
-		int MAX_ELEMENTS = 45;
+		GuiUtils.fillBorder(panelBuilder);
+
+		final int MAX_ELEMENTS = 21;
+
 		if (this.pageIndex < 0)
 		{
-			this.pageIndex = 0;
+			this.pageIndex = this.onlineUsers.size() / MAX_ELEMENTS;
 		}
 		else if (this.pageIndex > (this.onlineUsers.size() / MAX_ELEMENTS))
 		{
-			this.pageIndex = this.onlineUsers.size() / MAX_ELEMENTS;
+			this.pageIndex = 0;
 		}
 
 		int playerIndex = MAX_ELEMENTS * this.pageIndex;
 
+		// I want first row to be only for navigation and return button.
+		int index = 10;
+
 		while (playerIndex < ((this.pageIndex + 1) * MAX_ELEMENTS) &&
-			playerIndex < this.onlineUsers.size())
+			playerIndex < this.onlineUsers.size() &&
+			index < 36)
 		{
-			panelBuilder.item(this.createPlayerIcon(this.onlineUsers.get(playerIndex)));
+			if (!panelBuilder.slotOccupied(index))
-			playerIndex++;
+			{
+				panelBuilder.item(index, this.createPlayerIcon(this.onlineUsers.get(playerIndex++)));
 			}
 
-		int nextIndex = playerIndex % MAX_ELEMENTS == 0 ?
+			index++;
-			MAX_ELEMENTS :
-			(((playerIndex % MAX_ELEMENTS) - 1) / 9 + 1) * 9;
-
-		if (playerIndex > MAX_ELEMENTS)
-		{
-			panelBuilder.item(nextIndex, this.getButton(CommonButtons.PREVIOUS));
 		}
 
-		if (playerIndex < this.onlineUsers.size())
+		// Add button that allows to toogle different player lists.
+		panelBuilder.item( 4, this.createToggleButton());
+
+		// Navigation buttons only if necessary
+		if (this.onlineUsers.size() > MAX_ELEMENTS)
 		{
-			panelBuilder.item(nextIndex + 8, this.getButton(CommonButtons.NEXT));
+			panelBuilder.item(18, this.getButton(CommonButtons.PREVIOUS));
+			panelBuilder.item(26, this.getButton(CommonButtons.NEXT));
 		}
 
-		if (this.returnButton != null)
+		panelBuilder.item(44, this.returnButton);
-		{
-			panelBuilder.item(nextIndex + 6, this.returnButton);
-		}
 
-		panelBuilder.item(nextIndex + 3, this.createToggleButton());
 
 		panelBuilder.build();
 	}
@@ -229,17 +233,9 @@ public class ListUsersGUI extends CommonGUI
 		{
 			return new ArrayList<>(Bukkit.getOnlinePlayers());
 		}
-		else if (mode.equals(ViewMode.OFFLINE))
+		else if (mode.equals(ViewMode.WITH_ISLAND))
 		{
-			List<Player> offlinePlayer = new ArrayList<>(Bukkit.getOfflinePlayers().length);
+			return this.addon.getChallengesManager().getPlayers(this.world);
-
-			for (int index = 0; index < Bukkit.getOfflinePlayers().length; index++)
-			{
-				OfflinePlayer player = Bukkit.getOfflinePlayers()[index];
-				offlinePlayer.add(player.getPlayer());
-			}
-
-			return offlinePlayer;
 		}
 		else
 		{

src/main/java/world/bentobox/challenges/panel/admin/ManageBlocksGUI.java

@@ -79,7 +79,8 @@ public class ManageBlocksGUI extends CommonGUI
 		int index = 10;
 
 		while (entitiesIndex < ((this.pageIndex + 1) * MAX_ELEMENTS) &&
-			entitiesIndex < this.materialList.size())
+			entitiesIndex < this.materialList.size() &&
+			index < 36)
 		{
 			if (!panelBuilder.slotOccupied(index))
 			{

src/main/java/world/bentobox/challenges/panel/admin/ManageEntitiesGUI.java

@@ -79,7 +79,8 @@ public class ManageEntitiesGUI extends CommonGUI
 		int index = 10;
 
 		while (entitiesIndex < ((this.pageIndex + 1) * MAX_ELEMENTS) &&
-			entitiesIndex < this.entityList.size())
+			entitiesIndex < this.entityList.size() &&
+			index < 26)
 		{
 			if (!panelBuilder.slotOccupied(index))
 			{