This game does not play well without an actual mouse. I may make an updated version that handles that better.
This is a recreation of a puzzle game I play all the time on my phone.
Left click to grab a piece from the bottom of the screen.
While holding a piece, you can place it on the board where there are any openings.
If you are holding a piece that you don't want to place yet, use right click to drop it back to the bottom of the screen.
Filling up a whole line or square will clear those blocks and add to your score. Combos will increase the amount of points you gain.
Suggestions and comments welcome.