BioMotor Unitron is a pretty decent game. Umm... It's been a while since I've played (got it when it was first released and well been busy with so many other games.

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If I recall, the goal of BMU is to build the ultimate fighting robot. You have access to something like 6 maps (which are randomly generated), get cash, upgrade your robot, send it off to an arena. I think the goal is to win a certain number of arena matches? Umm... Again, I"m not 100% sure here.
The NGPC doesn't really have traditional RPGs in its arsenal.
It's still a good game though.
Puzzle Link 1 & 2 is IMHO the puzzler that has the most for its money on the NeoPocket.
The premise of the game is rather simple. There are a bunch of different coloured blocks on the screen. You control a "ship?" that moves left and right on the bottom of the screen. You get rid of blocks by building a pipe between two (groups) of blocks of the same colour (each group must not be touching the other). Once you blow up blocks, any blocks that were underneath them "fall upwards". Should they connect with blocks of similar colour which weren't previously touching, then they blow up in a chain reaction, etc.
There are 2 player modes of play.
There are two other Main modes of play in both versions.
Puzzle Mode: there are 50'ish puzzles (if I remember). These are static screens. You are given a certain number of connects. If you can clear the whole screen using less pipes then indicated then you get a bonus. If you clear the screen using more then you get less points. The game is over once you are stuck with one of a kind blocks. (Shouldn't happen unless you did the puzzle wrong.) And you can continue where you left off.
Normal Mode: lines of blocks show up at a certain pace. You need to prevent them from reaching the bottom of the screen. The level finishes when you connect to "End" blocks together. (They'll show up after a while). If you finish the level within a certain time-limit you get a "card".
There's an endless version of the Normal mode where there is no ending and no card awarded.
What the cards do:
If you get all of the cards in Puzzle Link 1 you get a slideshow.
If you get all of the cards in Puzzle Link 2, you don't get anything special... I think.
In Puzzle Link 2 there is a simple card game you can play using the cards you won. I think this game can be played with 2 players.