Good game for Game Boy Color. It has potential if you really get into it.
You are Wario. Your plane crashed in the middle of a forest, nobody is around, and you're screwed. The forest is also in a snow globe. What are the chances!? But wait! Wario can run around collecting keys and opening chests to get out. If I were Wario, I would be pretty pissed at that point in time. You continue your adventure anyway.
Run around, charge into some enemies, get some keys, unlock some chests, move on to the next level. It was a challenging game, though. This is the only Wario Land game I have played to this time and I must admit the game was good. My brothers got hooked, but I wasn't nearly entertained as them or as competitive. I just never cared what happened to Wario, he didn't mean a thing to me. All he ever did was break stuff or get hurt and scream. There were different colored Chests to unlock, some proving very difficult. (Last time I played I was 10.) With all that aside, this can be a great game to bring on a long car ride or if you have nothing to do over summer. I found myself getting tired of the game, started to play another game for a while, and came back to it eventually. Pick it up if you like Wario on Super Smash Bros. Brawl or if you've played the other games in the series. Don't spend much on it.