Teenage Mutant Ninja Turtles: Red Sky Battle

Red Sky Battle is an attempt by creators Pro Igork and ALEX_230_VOLT to extend and finish "Wrath of Shredder", a long abandoned TMNT fan project originally conceived by BonusJZ.

Per the creators:

Teenage Mutant Ninja Turtles - Red Sky Battle is a Ninja Turtle fangame created by Pro Igrok and ALEX_230_VOLT based on BonusJZ's Teenage Mutant Ninja Turtles - The Wrath of Shredder using OpenBOR. Actually for now, this game is more like an extension of Teenage Mutant Ninja Turtles - The Wrath of Shredder. The game features all 4 turtles playable + 3 secret characters (comparing to Teenage Mutant Ninja Turtles - The Wrath of Shredder with only Leonardo and Donatello playable + 1 secret character), 22 levels (comparing to Teenage Mutant Ninja Turtles - The Wrath of Shredder with only 6), 2 game modes, 4 player support and TMNT launcher - a special program to unlock extra features by entering codes, which can be found during gameplay.

The game is still in development and future version will be completely independent from Teenage Mutant Ninja Turtles - The Wrath of Shredder with exclusive plot, enemies and combat system.

Sadly, this development appears halted as well, and like BonusJZ the status of Pro Igork and ALEX_230_VOLT are unknown. However, despite technically being an abandoned demo, Red Sky Battle is fully playable and features an impressive level of detail, polish, and techniques. It is well worth a play-through and makes a fine addition to any TMNT fan's collection.