back in the day of my 800xl/130xe, i always played defender (that easy, i could play with my eyes closed)
I actually clocked it (as in 9999999 then 0000000) on more then 3 occasions and without cheating, you do need a decent, well worn atari cx40 to play it properly
I also got a the level 99 of Joust (easy level), again i really had to play the game solidly
Level 7 on warhawk (no cheats) but i know a cheat for it













