The inventory can hold 5 items at a time. The player can pick up items with the "Interact" action (Left-click or E by default) and use them with the "Use Item" action (Right-click or Q by default).
The player can scroll the mouse wheel or press the number keys (1, 2, 3, 4, and 5 by default) to select different items.
To swap an item, the player has to left click an item with another item selected with a full inventory. The player will pick up the new item and the old one will be left in its place. If the player approaches It's a Bully while having items, he will take a random item from their inventory.
The item the player has selected will have a red background in its square. If the player has an inventory slot selected with nothing in it, then the item slot will just say "Nothing".
The inventory has a different design and can only hold 3 items at a time. Once the inventory is full, picking up an item will result in the previous item getting permanently removed.
The inventory has the same design as one from Baldi's Basics Plus, but there are only 3 item slots.
Trivia
General
There will be a separated inventory to keep quarters in a future update, according to mystman12 during a livestream.[1]
Even though the "Nothing" icon () was built in Full Game Early Demo, it was not implemented in the later demos nor Baldi's Basics Plus.
Baldi's Basics Plus
In V0.1, pressing a number key did not select an item.
Classic/Birthday Bash
Baldi teaches the player how to use the inventory after completing and collecting the first notebook.[2][3] This does not occur in Baldi's Basics Plus and all demos.
When using hacks by teleporting out of the map of Baldi's Office, the player can see the inventory, along with the stamina meter and notebook counter.
Prior to V1.3, the 1, 2, and 3 number keys did not select items in the inventory.
Prior to V1.4, when starting the game, the text when selecting the first empty slot was "Item". But when the player collected and used an item or selected another slot, the text for all empty slots would become "Nothing" for the rest of the game.
Baldi's Basics Classic Remastered
In the "Baldi's Basics 3 Year Anniversary Presentation!" video, the inventory had 5 slots during development.[4] However, it only has 3 slots in the game.
Baldi's Basics Full Game Early Demo
Using the number buttons for some reason does not select the different item.
Glitches
Baldi's Basics Plus
When reaching the next floor, starting a field trip (prior to V0.3), or completing the Hide-and-Seek mode with an item in the first slot, when the floor starts, the first item will be selected but the text reads "Nothing".
↑"I'm considering giving quarters in like a separate item slot in the full game so you stack quarters instead of having them to take off from your item slot. I'm-I'm thinking about getting you like five slots in the full game and then get this new separate quarter slot." - Livestream archive 1:12:13-1:12:29
↑"You did great! Come here and get your prize! A shiny quarter! Just click on it with the left mouse button to pick it up! Then, when you find something you can use it on, right click on the object with the quarter selected! That's how you use items, you know." - BAL_GetPrize.wav file from Baldi's Basics Classic's asset files
) was built in Full Game Early Demo, it was not implemented in the later demos nor Baldi's Basics Plus.
