A fun, addictive puzzle game that is well worth the cheap price tag.
There are several different modes, including one that tells you if you've made a mistake (and one that doesn't), also there is a daily 'training' mode that keeps track of your times with specific challenges. There is also an online 'battle' mode where you can hook up with a friend (using a friend code) or a stranger (without a code) for small puzzle size battles to see who can finish first. There is also an online 'community' mode where you can trade puzzles that you made with friends, or download (for free!!) extra puzzles that Nintendo publishes every few months.
This games sells for $20 brand new and is definitely worth the buy if you come across it.