It's easy to dismiss Sugar, Sugar early into play as just another one of those games that revolves around shifting tiny particles. Keep with it though, and you'll find an ultimately relaxing and enjoyable puzzler.

The main idea is to draw lines to lead the falling sugar into the cups. Each cup needs 100 sugar particles to fill to the brim. Simple enough - then you have different coloured sugar, multiple cups, shifts in gravity... It never gets difficult, as you can keep drawing as many lines as you want to fix issues, and just hit reset if necessary, but it's great to watch the sugar piles up and seep through the cracks. It's especially entertaining when you have piles of different coloured sugar all over the place on later levels.

Play Sugar, Sugar on Bart's site.