Drag all the boxes
Fall into the water on the second test
Nikolai understood..
...
Turn on the generator
Get rid of the turret
Die from enemy 10 times
Survive in a room with gas
Solve the puzzle with weights
Die from a cannon shell
The enemy has caught you
Disable the turret
Skip the cutscene
Get the Best Ending
Get a Depressing Ending
Get an Abnormal End
Get the Worst End
Fall into trap
Die from the enemy
Take the pickaxe
Detect the enemy in the "second location"
Go to the "second location"
Do not pull the lever
Answer all questions correctly
Pass 1st test
What an explosion!
Get an "equal" end
Get level 5
Get level 10
Get level 15
Get level 20
Get level 25
Fly on a tire
Discard the chase by shooting
Win in any arcade mode
Lose in any arcade mode
Get the joke