25 Balls Glitch

The 25 Balls Glitch is a minor glitch where the player restarts from a 2nd or 3rd endless mode stage, or during the Random Rooms Glitch and gets 25 balls, like the Starting Stairs of the introductory stage.

However, restarting from a stage in the 1st endless mode has no effect - you will just have your normal ball count. Unless you know which endless mode the room is from (all the endless modes are the same apart from position), you can't tell what will happen.

Restarting in a room at a checkpoint you never reached before will make you lose (you haven't reached it yet, so you can't have any balls!).