Slow (when you want to play for maybe years?) [Speed x0.5]

Default (when you play idle or active many hours a day and want to play for some months)

Double (when you want to play for a while, still for months) [Speed x2]

Fast (when you want to play a little bit) [Speed x5]

Flash (when you want to finish the game as fast as Flash) [Speed x10]

Walkthrough (have a quick look what's possible) [Speed x25]

Start game