I'm guessing most of you know how to play this. If this is already a thread, please delete it. If it's in the wrong section, please move it. I have not seen a thread like this and I think I put it in the right place.
GemCraft 0 is a great sequel to the original. Same gameplay, but with enough new tweaks to make you want to beat it as well. Some of the levels are quite difficult, but what's the point if it is easy? A lot of TD flash games are immensely popular, but I think that especially the idea of combining your towers together, and the richly RPG-ish graphics brought it home.