Uneven Solitaire sometimes starts out locked, with the top of all piles isolated same-parity cards.
The first dozen moves are maybe a little tricky. But once you find an opening, it seems fairly easy if you focus on combining same-rank cards together. Just be careful to avoid having all piles locked with same parity. And you can split a same-rank group if you need more of that parity. (Maybe it should be 2-stars instead of 3)
(When I first started playing, I focused on groups of same-suit cards, but that's much less useful than groups of same-rank cards. It seems easy to win without using same-suit groups, except maybe a few moves at start.)