Very unusual and interesting results are obtained by crossing two or more puzzles. We present you the game Crossover 21 - the product of the combination of the Japanese crossword and card game Point. Take a short training course, you will quickly understand the principle of the game. Set cards on the playing field, focusing on the numbers on the edges of the field. You must make a combination of cards equal to 21 points. Collected cards will be deleted and you can install new sets again. The numbers on the edge of the field will quickly calculate the result so that you do not suffer from long calculations. If the set of cards is more than 21, the cards will be deleted, but in their place there will be crossed out cells in which you can’t install anything.