Complete the level 25
Find out the automatic elevator
Discover/Find out the floor system on level 16
perform undo 120 times
perform undo 100 times
reset a level 100 times
reset a level 80 times
Reset a level 60 times
Reset a level 40 times
Complete the level 13 without using any light switch
Perform undo 80 times
Reset a level 20 times
Find out the light switch
Complete the level 10
Perform undo 40 times
Disable an elevator with undo
Lift a block using the elevator
Complete the 5 initial levels
complete 5 levels without undo
Find out the electrical system
Complete 3 levels without undo
Reset a level for the first time
Reset a level 110 times
Reset a level 120 times
Perform undo 150 times
Perform undo 175 times
Complete 6 levels without undo
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