Andylll: I did it on the first speedrun on easy difficulty. It means, that you have to run in the doom wall from the begginning to the end of the level. But I think, it is not that difficult on the first speedrun after you bought some upgrades, because there are not high mountains, lakes, meteors, etc.
 "Sushi Cat"){kind=icon}
 "Mud and Blood 2")
 "Ragdoll Invaders")
 "Wake Up the Box")
 "Perfect Balance 2")
 "Ragdoll Avalanche 2")
 "Blocks With Letters On")
 "Frontier")
 "Pixelvader")
 "Agony: The Portal")
 "Cube Colossus")
 "Multitask")
 "Dino Run")
 "Pandemic: American Swine")
 "William and Sly")
 "Hedgehog Launch 2")
 "Cargo Bridge")
 "Dolphin Olympics 2")
 "Red"){kind=icon}
 "Four Second Frenzy"){kind=icon}