i love this game 5 stars !!!!!!! oh a here a hint to the right combination for the acid in the acid room: a paper on the wall which has the red, pink, yellow (twice) and blue colors (they're very tiny rectangles, so look more closely). Click on white (the color of the paper) to start the mix, then follow the hint of the paper itself. Very simple if you pay attention to everything in the room. but anyway it a 20% cooler game the story is good, the gameplay is nice and the puzzles were cool !!! so 5 Stars!