PerDiem has two free daily card puzzles. Delve is a dungeon crawl played with a deck of cards, based on the solitaire game Scoundrel. Stacks is a score puzzle about chaining cards that share a suit or rank. Both deal something new every day.
Delve: a dungeon in a deck of cards
Delve shows you rooms of four cards. Take three and the room refills. Monsters cost health, weapons soak up damage, and potions heal. The catch is that weapons wear down, so the order you take cards in decides everything. Every day's deck is checked by a solver, so it can always be won.
If you're looking to play Scoundrel online, this is the one. Delve is based on Scoundrel by Zach Gage and Kurt Bieg, with a new deck every day. Read how to play Delve.
Stacks: chain cards for points
Stacks gives you a grid of playing cards. Drag through a chain of touching cards that share a suit or rank to score it. You only get six stacks, and each day has its own modifiers that change what scores best. Reach bronze, silver or gold. Read how to play Stacks.
Which should I play?
Delve if you like planning a sequence of moves and trying again. Stacks if you like squeezing the most points out of a board. Both are free, run in your browser and need no account.
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Cliques is a domino puzzle with the same medal chase as Stacks. See puzzles with medals or every game by type.