Short Tail is Long Tail with a second deck and three more columns. Eight columns of a single card build down regardless of suit; a run of one suit travels; a complete king-to-ace suit run leaves the board. The reserve of unlimited depth starts with two cards and takes any card one at a time, only the top in play. The stock holds ninety-four cards and deals a card to every column, empty ones included — eleven full rows and a last row of six. Eight suits wins.
Shuffle two decks together. Deal eight columns of one card, face up, then two cards face up into the reserve. The remaining ninety-four cards form the stock. The eight scoreboard piles start empty.
Two decks mean two of every card, which is the help Long Tail lacks: a run of hearts can be assembled from either deck's cards, and a host exists twice. But twelve deals onto eight columns is a lot of burying, and the reserve is the same trap as before.
Short Tail is Long Tail's two-deck sibling: a deck and a column count change together, so it is a game of its own and not a count of the original. It carries the family's unlimited-depth cell and Relaxed Spider's stock that deals onto empty columns. Spider Web and Astrocyte hold the cell axis at one card per cell.
Short Tail runs in your browser — free, no download, no sign-up. Install it as an app on your phone or computer and it works offline. You get unlimited undo, a hint button that names a legal move, statistics that track your wins and times, and seeded deals: every game has a seed you can replay, so a board you enjoyed (or lost) can be played again exactly.