Collect 50 health items at one level.
Find the reference to the John Romero's failed project.
Find a reference to the Yakuza series.
Find and scan hidden QR code.
Complete levels 1-3 without dying.
Choose the 4th ending.
Choose the 1st ending.
Choose the 3rd ending.
Choose the 2nd ending.
Blow up 5 pickups in chapter 5.
Find the secret moderation room in chapter 2.
Find the gold reel.
Earn 50,000 points in a rhythm game.
Activate the secret key combination in the main menu.
Get to the demo screen in the retail version.
Complete the game.
Find Swiborg's ball.
Take the boss out of the building in chapter 5.
Die 5 times in a row in the tutorial.
Get hit by wheels 20 times in chapter 3.