update

mods/creative/inventory.lua

@@ -174,18 +174,17 @@ function creative.register_tab(name, title, items)
 			else for item in pairs(fields) do
 				  if item:find(":") then
 				  	if not is_mapmaker and not is_teacher and not sandbox then
-				  		if not sandbox then
-					  		minetest.chat_send_player(player_name,
-								minetest.colorize("#FF0000",
-									"ERROR: Privilege 'mapmaker' or 'teacher'" ..
-									" required to get this item"))
-
-					  	elseif worldname == "coding_schools" or
+				  		if worldname == "coding_schools" or
 						   worldname == "science_factory" then
 					  	       minetest.chat_send_player(player_name,
 								minetest.colorize("#FF0000",
 									"ERROR: You cannot use any other item " ..
 									"on this map except the kidsbot"))
+					  	else
+					  		minetest.chat_send_player(player_name,
+								minetest.colorize("#FF0000",
+									"ERROR: Privilege 'mapmaker' or 'teacher'" ..
+									" required to get this item"))
 					  	end
 
 				  		return

mods/default/hud.lua

@@ -15,6 +15,13 @@ end
 
 minetest.register_on_joinplayer(function(player)
 	minetest.after(0, add_text, player)
+
+	local is_mapmaker = minetest.check_player_privs(player, "mapmaker")
+	local is_teacher = minetest.check_player_privs(player, "teacher")
+
+	if is_teacher or is_mapmaker then
+		player:hud_set_hotbar_itemcount(16)
+	end
 end)
 
 minetest.register_globalstep(function(dtime)

mods/player_api/init.lua

@@ -28,6 +28,6 @@ minetest.register_on_joinplayer(function(player)
 		{x = 200, y = 219},
 		30
 	)
-	player:hud_set_hotbar_image("gui_hotbar.png")
+	--player:hud_set_hotbar_image("gui_hotbar.png")
 	player:hud_set_hotbar_selected_image("gui_hotbar_selected.png")
 end)