The combination to the safe in the game "Sift Heads World: Act 5" is 6, 22, 4. Use the right and left arrow keys to point to the numbers. The safe is part of an in-game quest called "Stealing Thieves" and contains the cash used in the game.
The fifth act of the Sift Heads World game follows its main characters Vinnie, Shorty and Kiro on their assignment into the Amazon Rain Forest. They face interruptions, intrusions and challenges from local mercenaries who are in the area on their own mission to obtain cash. The game is a free-ware game and has an initial download file size of 8.32 megabytes.