Redheads
Quite an entertaining little game where worrying back appears to be essential.
Rated Very hard 1%
Game #2 is winnable
A clever little trick I use occasionally involves worrying back. In this hypothetical scenario, one tableau pile contains 3H,2C, AD. Another one ends with 3D. A foundation already has a 2C so you can worry back the 2C onto your vacant 3D and move the AD from the other pile onto that 2C. That will expose the other 2C which can now go onto the foundation where the other one had been. It exposes a 3H which can go up onto a foundation that had a 2H already there and thus empty a column.
Difficult to explain. Try it with some playing cards. It is a very ingenious little strategy that can occasionally allow you to make an otherwise seemingly impossible move.