[emj]

Feels a bit too hard, I've only managed to clear one line. Building straight lines out of triangles seems hard, there are so many overhang pieces. Not saying it needs to be easier but I might need some help to get started.

[dukoid]

If the pieces could be rotated by 45° that would help I think?

[airstrike]

It needs a 2-piece triangle to make a lot more empty spaces viable, or even an occasional 1-piece to allow for fixing mistakes