Simple at first. Using it for Japanese: Fun and not taxing when you're learning katakana & hiragana shapes. Unfortunately the algorithm sometimes makes you draw with no hint first & only *then* shows an outline or other aid. Gets annoying quickly! As for the snippets of more complicated sentences, they're just too random to be used as anything other than a gimmicky memorising game. Free version limited to 5 minutes per day which makes you rush instead of studying properly. Can't recommend.