Cheat mode (Strider 1)
Successfully complete the game to unlock the "Player Set-Up" and "Stage Select" selections on the option menu. "Player Set-Up" allows you to select costume color, the number of energy bars, and the ability to permanently power up your Cipher.
Strider Hien (Strider 2)
Successfully complete the game to unlock Strider Hien.
Infinite Boost (Strider 2)
Successfully complete the game with Strider Hien to unlock the "Infinite Boost" selection on the option menu.
Successfully complete both Strider 1 and Strider 2 to unlock Stage 00 in Strider 2.