8 Eyes (1990) is a Castlevania clone that was made by Thinking Rabbit, the originators of Sokoban. But, unlike Castlevania, this game is set in a post-apocalyptic future in which eight nuclear explosions almost destroyed Earth. The game features two characters—the human Orin and his falcon Cutrus—in either 1- or 2-player mode. Cutrus can attack enemies, hit switches, collect items, and generally do all sorts of useful things.
The game allows the player to recover the eight jewels in any order. The player can save time in the boss fights by choosing the optimal sequence.