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 three years by a team of devoted Nintendo fans. Requires a copy of New Super Mario Bros. Wii and is 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.

Get the game, as well as three smaller spin-offs, here.

The hack was followed by Newer Super Mario Bros. DS (a mod for the original New Super Mario Bros., released on Christmas 2017). Newer Super Mario Bros. U (which would've been based, of course, on NSMBU) was planned, but ultimately cancelled. However, an Updated Re-release of this game (tentatively titled Newer Super Mario Bros. Wii Deluxe) was later announced to celebrate the 5th anniversary of this game.

Tropes in this game: