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The engine rotates the cogwheel attached even when the game is closed. You can add engine upgrades to make it spin the cogwheel faster.


Level Cost Effect
1 +1 Engine
2 +1 Engine
3 +1 Engine
4 +1 Engine
5 +1 Engine
6 +1 Engine
7 +1 Engine
8 +1 Engine
9 +1 Engine
10 +1 Engine