Is there any way to access delisted Xbox Live Arcade games?
Delisted Xbox Live Arcade games can only be accessed if they've already been purchased under your account. In that case, they can be re-downloaded by going back through your Purchase History.
Outside of that, if you haven't purchased a game yet and it's been delisted, there's no way to get it.
You can get some games via download code, some exist but are rare, like joust or tmnt arcade. check ebay or bestbuy.com