How to play
Start by revealing face-down tableau cards. Prefer a move that exposes a card over one that only rearranges cards you can already see.
Do not fill an empty column just because a king fits. An empty column is your strongest temporary space, so use it for a king that opens another useful move.
In Draw 3, remember the order of the waste. Removing one card changes which cards will be exposed on the next pass. Use Hint when you want a move on a verified winning path, and Can I still win? when you want to test your whole line of play.
Reveal before you rearrange
The 21 hidden cards are the whole puzzle. A move that turns one face up gives you information; a move that shuffles visible cards between columns usually does not. When two moves look equal, pick the one that uncovers a card.
Start with the tallest column
The right-hand columns hide the most cards. Freeing one of them opens more of the deal than clearing a short column on the left, and it is the usual way to reach an empty column that matters.
Keep an empty column for a king that helps
An empty column is the only space where you can park a run. Move a king into it when doing so uncovers a card or frees a run you need, not simply because the king fits.
Don't rush cards to the foundations
Aces and twos belong on the foundations right away. Higher cards can wait: a black 5 on the foundation cannot hold the red 4 you need to move next. You can bring it back, but it costs a move and often a plan.
In Draw 3, watch the order
Playing a card off the waste shifts every later group of three by one card. Before you play one, look at what the next pass will show; sometimes it is better to leave a card where it is so that the one you need comes up.
When you are unsure, ask the board
Can I still win? searches the positions reachable from here. If it says no, undo until it says yes: that is where the game slipped. Hint plays the solver's next move and says why.