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This game is a tribute fangame to the ''Raiden Fighters'' series of top-down scrolling shooters by SEIBU KAIHATSU INC. It also incorporates a few elements from games by Psikyo, Raizing/8ing, and Cave.
The game boasts a roster of playable original ships, such as the balanced Amada Vipros, the fast Phyxius, the damage-dealing Zaiva, and the finesse Xelcor. It also features a varied array of guest fighters, serving as cameos from other SHMUP games, both well known and obscure. There is even a certain dual-type Electric/Flying Legendary Pokémon that appears as a guest fighter.
There will be 22 stages to play in the game. However, not all of these stages will be played through in one session. Stage progression is non-linear, meaning that the next stage depends on whether certain objectives are completed or failed. The optional EX Stages serve as a challenge for the experienced SHMUP player, as well as unlocking the guest fighters.
The plot of ''Xeno Fighters EX-R'' involves BRES, a group of humans subverted and corrupted by a race of hostile extraterrestrials known as the Keto, launching attacks against the forces of ATHENA through various periods in Earth's war history. The guest fighters and the EX Stages do not have any connection to the plot.
''Xeno Fighters EX-R'' has a long development history, starting in 1998. in 2009, The game's title has been changed to just "Xeno Fighters R" and still maintain this title up to this year.