Type one of these for your name on the high score table to jump to the corresponding level.
1-"SUSS" | 3-"URTI" | 5-"NOUS"
2-"IMED" | 4-"BASD" | 6-"RERO"
Also on the high score table, enter "ILLBEBACK". This will give you infinite lives and let you choose levels with 'F1-F6'.