Successfully complete Arcade mode as Raiden. Enter the character selection screen. Highlight Apharmd B, then press X. Highlight Apharmd S, then press X. Highlight Dordray, then press X(2). Highlight Specineff, then press X(2). Highlight Fei-Yen, then press X(2). Finally, highlight Cypher, then press X(3). Prototype Raiden cannot air dash, double jump, or use turbo weapons but has increased damage.