To progress in Into the Pit and get any of the endings, you'll need to enter the Arcade - but Bonnie is standing in your way. You'll need to put some thought into how you can get this eerie animatronic out of the area so you can explore it safely for yourself. Here's how to lure away Bonnie the Rabbit from the arcade so you can look around in Five Nights at Freddy's: Into the Pit.
How To Distract Bonnie In Into The Pit
Your Sketchbook is your best friend when dealing with animatronics in Into The Pit. It provides insights about each animatronic - for example, letting you know not to eat around Chica.
On the next page of your Sketchbook after Chica, you'll find some drawings of Bonnie and some information about the robotic rabbit.
One note about Bonnie says "DO NOT attempt to play Bonnie's guitar." Since we want to lure Bonnie away from the arcade and distract him, this is a hint that we should not follow that advice and should, in fact, mess with Bonnie's guitar.
How To Fix Bonnie's Guitar
However, Bonnie's guitar unfortunately isn't just sitting out ready to be played. As the Sketchbook also notes, the guitar breaks a lot and needs new strings. Those strings, they say, are available in the Mill now that the pizzeria isn't open anymore.
So, you'll need to first interact with Bonnie's guitar to instigate the quest - and then head to the Mill. From here, you should be able to find the strings that you'll need to repair Bonnie's guitar. Bring them back to the pizzeria and interact with the guitar one more time to fix it before playing it on stage, allowing you to lure Bonnie out of the arcade.
Of course, Bonnie might be out of the arcade, but he's also headed straight to your location. To avoid getting hurt by Bonnie in this interaction, find your way into the vents and hide. Once you're safe from Bonnie, you can head back to the arcade and finally explore without worries.