上書きする

to overwrite (うわがきする)

-- save file, data

消す

to erase, delete けす　(kesu)

--like a save file

カートリッジ

cartridge (kaatorijji)

like for a Game Boy Advance...

ゲーム

GAME ;p (geemu)

I'll put romaji in white, so if you want to see it, just highlight between the parentheses. Just know, though, that romaji is the bane of every Japanese student...