Game file created by IncrediBots 2, a physics-based simulation game that allows players to create their own worlds, called Challenges; saves objects and physical properties of the world.

IncrediBots 2 does not save IB2 files directly. Instead, when saving a challenge, the game provides a plain text string that can be copied into a text file and later loaded back into the game. While the .TXT extension could be used, a recommended file extension for these save files is ".ib2," which stands for IncrediBots 2.