If the Wii UI has a killer, must-have title -- Super Mario 3D World is it! Mario titles seldom depreciate, so when a fresh Mario game that's been out for less than two months dips below the £30 mark, it's all systems go! The Game Collection have Super Mario 3D World down at £29.95, saving you £7 or so, for the next fourteen hours at the time of writing.
If you have a Wii U and you don't own this game yet, sort it out! A tip of the cap to BuzzDuraband for the spot.