Whiskers is the hardest worker! These little manipulators refused to work without sleep but could play with their toys forever with 0 energy. I also liked that Forklift had a toy right next to the treadmill and when he got tired, he just slipped down into it and started chilling. A great choice was not to punish the player for not taking care of the cats before their resource completely depleted so I could role-play the realistic manager - tending to the worker only once they've fallen.