Liight will only set you back 500 Wii points ($5) for 100 premade "Solve" stages and the opportunity to make your own and trade them with friends (plus "Endless" mode, I guess). That makes it an easy recommendation. Puzzle fans should definitely pick it up, and anyone else who thinks the concept sounds interesting won't be wasting too much money to give it a try.
SBG: "Looking for a good game for yourself or someone else this holiday season? We’ve got you covered. The Wii may have had a rough year, but there are some titles you definitely shouldn’t miss."
"Although I was a bit skeptical about whether or not Liight would truly leave a mark, I was so pleased to see that it successfully rises above many of the puzzle games we've seen on the service." -- Wiiloveit.com
Destructoid:
We first heard about Liight at PAX Prime 2009, where it was one of the PAX 10 featured independent games. Other games from that group include critical successes such as CarneyVale: Showtime, Osmos, and Machinarium. Certainly, it was in good company. After an exceptionally long time spent in development, Liight finally released with little fanfare on WiiWare last month. Did the extra development time allow Studio Walljump to create something extraordinary?
Perhaps a more fitting question would be, "did Liight deserve to be in the company of such fantastic games in the first place?"