Namco Handheld Games (8 listed)
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These are all Namco licensed games. They were distributed by Varie in Japane, Systema in the UK, and Yeno (not sure where... Germany maybe). (I don't believe these were sold in the US at all). (Galaga '91 is the only one I know I've seen with both Varie and Yeno on it.) (Except Chibimaruko, this seems to be sold by Namco, not Varie or Yeno, and is obviously not part of the same series).
Baseball '91
Chibimaruko
Dragon Spirit
Final Lap
Galaga '91
Galaga 2000
Pac Land
Splatterhouse