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Thanks to game-icons.net for the bowling art.
This is one of Sid Sackson's designs included in his 1969 book A Gamut of Games from which I also took Solitaire Dice.
Twenty number cards (aces are one) of the same colour since suits don't matter in this game are shuffled, and then ten are arranged in an inverted pyramid shape as in bowling pins — quite an education for me in CSS layout.
The remaining ten cards form an open drafting pool of three decks: the first with five cards, the second with three, and the third with two.
The same scoring method as in ten-pin bowling is used. A game involves ten frames of two balls each. If you managed to knock out all pins without needing to discard the available face-up cards, you score a strike. If you remove all pins after needing to discard, you score a spare. Else you score the number of cards removed.
Each turn, select a face up card and play it to remove "pins" from the pyramid. On the first turn, any pin other than those in the backrow or centre third-row may be selected. After that, only pins next to a previously removed pin may be selected.
Up to three pin cards can be removed by a ball card provided they are neighbours and the last digit of the value they add up to matches the deck card played.
If none of the available face up cards can remove a pin, move any of the cards to the right-most deck space to move to the second ball of the frame underway. This causes all the top cards to be discarded and the second phase, ie ball, of the frame commences.