HDOS uses the same engine as 3 Minutes on the Beach but contains 35 levels of mind blowing puzzles to crack. There is a HUGE prize at the end if you manage to unlock all security layers. Playing is easy. Swap two gems by clicking, or move gems to empty places. A level is complete when all gems are gone. Don’t give up!
This game is a tribute to Tetris attack / Planet Puzzle League / Panel De Pon / Puzzle Frenzy / Yoshi’s Island / Pokemon Puzzle Challenge / Half-Life / Portal