Video Game: Newer Super Mario Bros Wii

Newer Super Mario Bros. Wii is a full unofficial sequel to New Super Mario Bros. Wii, crafted over the span of 3 years by a team of devoted Nintendo fans. Playable legally on any homebrew-enabled Wii; no piracy or hardware mods needed.

A trailer (with links to Let's Plays) can be found here. Additionally, here is the developer walkthrough.

Tropes in this game