Fillbots 2 (ロボット第2工場,The Second Robot Factory?) is the 37th minigame in Rhythm Heaven. It is the sequel to Fillbots 2. However, there is a new robot you need to fill up, and it is the smallest out of all the robots, requiring only one beat.
The Gameplay is exactly like the original Fillbots, in which you tap and hold the stylus to fill it up, and release to stop filling. Filling them too much or too little will not let it work, at which the robots emit an "error" noise. The length of the game is also extended longer than Fillbots. Lights will flicker out at a point during the game and only the fuel nozzle, the fuel, and the robots' eyes will be lit in the room.
Press & Hold A button: Fill
Simple Tap Mode
Tap & Hold: Fill
Hit: The robot will fly off if it's fueled exactly on time or do a little dance if it's not exact but still good enough for a hit.
Barely: If the robot is underfueled, it will appear dazed and tilt its head from side to side. If it is overfueled, it will grab its head as if it were about to explode, with its eyes growing large. A barely counts as a miss.
Miss: The robot will continue down the conveyor belt if the player doesn't do anything. If the player misses while attempting to fuel, the robot's head will tilt. If the player fills the robot too little, it will have crosses on its eyes and appear sad. If the player continues fueling too much, the robot will explode.
The game is also rather infamous for its many offbeat robots and darkness sections. Combined with the sheer amount of robots and the length of the game itself, Fillbots 2 has become a notorious game among fans.