Hidden Tower Of Druaga  In the museum, press and hold L1+R1 and press Up, >, Down, <, Up, >, Down, <, Up, >, Down, <. When the pickaxe appears, enter the Tower halls, bump into the wall, press X so Pac Man digs through the wall.

Pole Position II (Alter Tracks)  At the test menu, press Triangle, choose dipswitches, put the first one on, return to the main game, and select course.