Basics - New Super Mario Wii Guide - IGN

Some levels have secret goals -- they look like red versions of the flags at the end of a level -- which lead to Warp Cannons, Mushroom Houses, secret levels

New Super Mario Bros. U & New Super Luigi U Combo Edition - IGN

New Super Mario Bros. Wii Review (Wii)

Star Coins - New Super Mario U Guide - IGN

Basics - New Super Mario Wii Guide - IGN

New Super Mario Wii Guide - IGN

New Super Mario Wii Guide - IGN

Mario & Luigi: Dream Team (for Nintendo 3DS) Review

New Super Mario Bros. Wii Game Guide

World 4-5 - New Super Mario Wii Guide - IGN

World 1-4 - New Super Mario Wii Guide - IGN

World 4-1 - New Super Mario Wii Guide - IGN

World 8-5 - New Super Mario Wii Guide - IGN