Wario Land 4 is a puzzle game that isn't too hard, but not too easy. Wario Land 4 has a great selection of levels. Every level is in a passage. This game comes with several passages with 5 to 7 levels per passage. Wario Land 2 wasn't very good in a sense you couldn't die. It was nearly impossible to kill Wario. Even in this game, it's still a little bit tricky, but it doesn't feel like it's made for 5 year olds, which is a relief. Wario opens doors with triangles. The hole game is basically finding triangles, and opening doors, and solving puzzles. Whenever you're done with a level, it gives you a certain amount of time to get out. Which can be difficult because most of the levels in this game have many rooms. This game usually goes for 10 to 20 dollars:
http://www.vintagestock.com/catalogsearch/result/?cat=0&q=wario+land+4

http://www.amazon.com/gp/offer-listing/B00005MI42/ref=sr_1_1_olp?ie=UTF8&qid=1405363750&sr=8-1&keywords=wario+land+4&condition=used

http://www.lukiegames.com/Wario-L-4-GameBoy-Advance.html?gclid=Cj0KEQjw_42eBRDHqcG1psmtneEBEiQAWPL8WC9F_0PZ7mROxgPIx6c3fVlfaX3rUboXSuEkdcRVBggaAjja8P8HAQ

Please rate and subscribe if this video was helpful. It helps me a lot! (: