SpongeBob: Hidden Letters is a Puzzle game. You can play SpongeBob: Hidden Letters in your browser for free. In SpongeBob: Hidden Letters each picture contains 26 hidden letters, and there is a total of three pictures for you to make your choice from. When you find a letter, simply click on it. There is a time limit of 300 seconds for each image, however, you can choose to turn it off if you want to take it a bit more relaxed. Have Fun!