Blocks with Letters On 4 is a unique puzzler that combines Sokoban and wordplay. Each level requires you to arrange the lettered blocks so that they spell out a word in the yellow area. Grey blocks obey the laws of gravity, while white blocks can defy gravity. You will encounter switches, block rotators, sticky glue, letter changers, teleporters, and block duplicators throughout the game's 30 levels. If you get stuck on a level, you can reveal the first letter of the word or grab a hint that will help you solve the puzzle.