It's Kirby V.S. Meta Knight! Credit to djm111 for the Kirby Superstar sprites, and credit to shadow007 for the winning music and sprites (victory themes). Please check out their projects too! Kirby Controls - a, d, and w keys to move. - f, r, c, and s keys to attack. Meta Knight Controls - arrow keys to move - m, k (lol mk), space bar, and down arrow to attack. Please report if Meta Knight kills himself, so I can fix it immediately, because I am not sure if I have completely checked it.
