Why play Calculation?
Calculation is a planning-heavy solitaire game where arithmetic sequencing matters more than suit or tableau movement.
New variant
Calculation Solitaire
Four foundations each build to a King by a different interval — by ones, twos, threes, and fours — regardless of suit. Draw one card at a time from the stock and place it on any of the four waste piles, or directly onto a foundation if it fits. The top card of any waste pile may always be moved to a legal foundation. Careful planning of your waste piles is the key to winning.
Click the stock to draw a card, then click a waste pile or foundation to place it.
A 2 3 4 5 6 7 8 9 10 J Q K
2 4 6 8 10 Q A 3 5 7 9 J K
3 6 9 Q 2 5 8 J A 4 7 10 K
4 8 Q 3 7 J 2 6 10 A 5 9 K
Waste 10
Waste 20
Waste 30
Waste 40
Rules overview
Each foundation advances by a different interval, and the four waste piles serve as temporary storage that can easily trap the wrong card.
Strategy tips
- Dedicate waste piles to compatible future ranks when possible.
- Do not bury cards that belong to the shortest remaining foundation chain.
- Think several draws ahead before choosing a waste destination.
Need more detail? Read the Calculation strategy guide.