Simply-Tetris is a nice little widget that will enable you to play your favorite game in the internet browser.

Navigation:
left (or J),
right (or L)
down (or K)
Return, to drop down

Rotation:
space, I or up-Key (default),
A (left) and
S (right)

Six standard Token like I,J,L,O,S,T and Z
Optional: four special Token like 2,5,+ and U

Requirements:

· Opera