Diagonal Solitaire is a hard game and requires a lot of time and patience. Chances of winning are low, but fun is guaranteed.
Group the cards in descending order (from King to Ace) and with the same suit. The game ends when 8 of these groups are formed.
The origin of the name of this game is in the format created by the cards after they are dealt at the beginning. You can see that there is a diagonal formed by two sets of cards: the face down cards (upper left corner) and the face up cards (lower right corner).
Diagonal Solitaire is very similar to Scorpion Solitaire. Basically, the difference is that this game uses two decks (whereas that one uses only one), has nine stacks (instead of seven) and has a Reserve, which serves as an auxiliary stack. Also, this game is much more difficult than Scorpion Solitaire.
It is a game similar to Spider Solitaire (4 suits) and it is very fun and easy to play.
Canfield Solitaire is a difficult game with low chances to win (turn three variation).