Lady Bug

Lady Bug is a 1980 video game in which you go through a maze eating dots and other things while avoiding four enemies which emerge from a box in the middle. In other words, it's practically Pac-Man, except by Universal instead of Namco.

Lady Bug has a few differences from Pac-Man, though. The characters are all insects. The bonus items are vegetables rather than fruits. The maze has no Wrap Around passages. And most significantly, there is no Power-Up that lets you eat the enemies; instead, the maze has turnstiles which can be flipped to block the movement of the predatory insects, and hearts and letters which give different bonuses depending on whether they are red, yellow or blue when collected.

Tropes:

 * Poison Mushroom: Skulls kill any insect that runs into them.
 * Score Multiplier: Points are multiplied after eating blue hearts.
 * Spelling Bonus: Spell E-X-T-R-A for an extra life, or S-P-E-C-I-A-L for a Bonus Stage.