Chuo-Sobu-sen SPEED (中央総武線SPEED) is a real-time card game for two players. (The rules suggest three is possible, but do not explain any rule differences.) The deck contains two cards for each station on the real-life Sobu line that runs east of Tokyo, along with two "new station" wild cards. The cards are shuffled and divided evenly among the players. Each player forms a tableau of four cards from their deck.
The players simultaneously reveal a starting card from their deck. At this point, players attempt to play cards from their tableau, either by playing an adjacent station on the Sobu line, making a transfer through another real-life rail line (printed on the cards), or playing the new station card. The first player to verbally call out their route gets to play the card. If a player plays the new station card, only that player may play the next card on that pile.
If there are no legal plays remaining, each player simultaneously plays a new starting card, either from the deck if possible, or from the tableau if the deck is empty.
The player who plays all their cards wins, and scores points equal to the number of cards unplayed by their opponent.
Decks using the same ruleset exist for the Yamanote, Keihin-Tohoku and Chuo lines, and since the lines overlap in real life, the decks can be integrated together.
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