Shenkuu Tangram is a fairly easy game that can earn you 3,000 neopoints in about 5 minutes.
The first few times I played I did not do very well but with a little practice you can easily get the hang of it. The key is to remember where the pieces belong.
There are three levels and the three levels each have five tangrams. The tangrams don’t always appear in the same order, but they always appear in the same level. The later tangrams are harder, but if you know where the pieces fit going into the game its easy going.