* Story Mode: Silver Surfer is unlocked by progressing through the story mode, specifically during the "The Silver Surfer" mission.
* Character Tokens: You can find character tokens throughout the game, and some of them unlock Silver Surfer.
* Free Play: You can find him in Free Play mode after unlocking him through one of the previous methods.
Remember that you need to complete the "The Silver Surfer" mission in story mode to gain access to him in free play.
If you're looking for other cheats or tips for Lego Marvel Super Heroes, you can search online for "Lego Marvel Super Heroes cheats" or "Lego Marvel Super Heroes tips".