From the Super Mario Wiki, the Mario encyclopedia
Chronos Twins is a downloadable microgame in WarioWare: D.I.Y. and WarioWare: D.I.Y. Showcase. It was released in America on June 14, 2010. And was made by Julio Moruno of EnjoyUp Games. The microgame is based on the Nintendo DS game called Chronos Twins also made by Julio Moruno.
The game starts off with two timelines (past - top and present - bottom), two heroes, and two monsters (one in each timeline). The objective of the game is to shoot the monsters and survive. If the hero from past or present gets hit by one of two monsters, both will die, and the game automatically ends in a loss.