Here is a hack for Thundercade where you can control two players with one controller at the same time making game-play much easier. You must select the 2-Player option to take advantage of the hack.
Thundercade (USA) - NOINTRO
CRC32: 6C430704
MD5: 239975B0D4860C47E6017C9AB328C98C
SHA-1: DBCA566355D482F529D853DD6801B0B6868B18E4
SHA-256: DA3E007E38D9895DCB76F87A760D4834536E91B8BDB4DAFEB8D7CD5BFE14856C