Monster Truck Hidden Keys - Play Monster Truck Hidden Keys Online - funny free online game. Monster Truck Hidden Keys is free online skill and hidden object game. Find out hidden keys specified images. Each level has 10 hidden keys. There are 6 levels total. The time is limited so be fast and find all hidden objects before time runs out. Clicking wrong place several times reduces time by additional 5 seconds. So, if you are ready start game and have fun! , enjoy online game!