Namco Museum on the Nintendo 64

Namco Museum 64 for Nintendo 64 features the following classic games

Pac-Man (1980)
Ms. Pac-Man (1982)
Galaga (1981)
Galaxian (1979)
Pole Position (1982)
Dig Dug (1982)

Cheats

Galaga

There is a well-known cheat that causes enemy units to stop firing.

It works on most (but not all) machines. Here it is:

On the first stage, kill everything but the two bees in the bottom
left corner. Then wait, dodging the bees' shots, until the
bee no longer drops any shots towards you. After the bees stop
firing, let it pass for 5 more trips or so and then kill them. For
the rest of the game, the enemies will not drop shots. It will
take approximately 15 minutes for the bees to quit shooting at
you, so this trick requires a lot of patience.

Screenshot

 

Video