Happy Saturday! I hope you are all staying cool from this wicked heat wave!! Inverse Universe - Room Escape, originally $1.99, is today's free app. Two universes are collapsing together and it?s your job to stop them! Escape rooms by discovering clues, solving puzzles, finding and using objects. Though unsolvable within one universe, puzzles can be solved by bringing objects into the other universe and seeing its inverse effect. Sounds like my kind of puzzle game.