Star Trek: Invasion [PSX]

Level select:
Press Up, Left, Down, Right, Up, Right, Up, Down, Left, Up, L1 + R1, L2 + R2 at the level selection screen.

View credits:
Press Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down at the mission briefing screen.

Secret missions:
1A - Finish mission 1 in under five minutes, two seconds with more than 40 percent accuracy.
4A - Finish mission 4 in under six minutes, 44 seconds with more than 40 percent accuracy.
5A - Destroy half of the energy plough and pull the other half in with the tractor beam.
5B - Look for an info unit between the two asteroids somewhere near the broken shuttle and pull it in with the tractor beam.