I Wanna Be the Guy has spawned a number of fangames.
- Created by Tijitdamijit and his friends. It is the most popular fangame to date, and has been submitted to Moddb.
I Wanna Be The GB
- Created by Ashimoto. Note: GB does not stand for Game Boy.
I Wanna Be The Tribute
- Created by Shaman666
- Created by Storyyeller. Unusually for fangames, it was written from scratch in C++, rather then using an engine such as Game Maker or MMF2. Due to the different engine and differing design philosophies, it contains a number of differences from most other fangames. It is also the only fangame designed to easily support Speedruning, with built in features including savestates, replays, and single frame advance.
I Wanna Be The Ultimatum
- Created by Matt and Kyle.
Fangame The Game
- Created by VertigoElectric. Notable for being the only major fangame to be created with MMF2. Also, the mouse kills you. Unfortunately, it's been in Development Hell for a while. In addition, it isn't really a fangame, it's more like an "inspired by IWBTG" game according to VertigoElectric.
I Wanna Be The Shrine Maiden
- Created by holy. Based on Touhou. Has a sequel.
The Dross Game 2
- Created by Rogelio Díaz, in a tribute of a venezuelan blogger named Angel David Revilla (Dross Rotzank). He writes the blog "El Diario de Dross", a very sadistic and black-humor diary in spanish language.
I Wanna See You Suffer
- Created by UltraJMan, who started creating it following his hellish, rage-inducing run through I Wanna Be The Fangame, and it is far more sadistic than IWBTG or IWBTFG. Currently in its alpha stage, it starts you off on an agonizing descent through a spike tunnel that you will spend at least a few dozen tries getting through and it just gets worse from there. One only wonders what JMan was thinking when he made this. He was getting Revenge on everyone who encouraged him to play IWBTFG.
- Created by Solgryn. Like Fangame, it was also created in MMF2. Contain gratuitous swearing, and lags horribly on some computers, but is quite fun otherwise. Also worthy of being one of the most visually stunning fangames out there.
I Wanna Be Myself
- Created by SirRouven. This game contains less cheap kills, but the bosses are even harder.
I Wanna Be The Rockman
- Created by Dakaarts. This game replaces The Kid with Mega Man and also borrows a lot of influences from his franchise. It doesn't have quite as many cheap tricks as most of the other fan games, but it's still pretty insane. It was unfortunately abandoned in 2013.
You're the Kid Now, Charlie Brown
- Created by The Blue Sky Studios marketing team in celebration of The Peanuts Movie. This game depicts The Kid in the Charlie Brown art style. This game is fairly short, having three levels and a fight against Mecha-Woodstock. Can be found here.
Tropes Common To Fangames in General
- Fan Sequel: In play with any fan game with a length that matches the original game.
- Playable Menu: Of course, if the game doesn't throw ya into the first level straight away. Naturally, the menu CAN BE the first level.
- I Wanna Be The Better Er- Engine not only allows players to select difficulty on the first level. They also can remap the controls right there.
- Sturgeon's Law: Unfortunately, the engine makes it easy for people to attempt to create fangames, regardless of whether they actually have any skill. This even got to the point where the creators of said engines decided to remove them from the forums to stop the horrible fangames.
- Troll Fic: I Wanna Be the Guy doesn't have troll fanfiction, but it does have troll fangames.  and  are some of the more obvious examples, though theoretically, any of the horrible fangames could be secretly trolls.