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