Slapjack

How to play

1. Pick an opponent and a level, then tap Start: Choose Computer or 2 players. The computer has three levels, each tile showing how fast it reacts: Easy slaps in about 0.75–1.15 seconds, Normal about 0.52–0.82 seconds and Hard about 0.38–0.60 seconds. Easy is selected by default, so you can tap Start right away.
2. Watch the deal and the 3·2·1 — then the cards turn on their own: One 52-card deck is dealt alternately into two face-down stacks of 26. After the countdown the two stacks take turns turning a card into the middle on a steady beat: every 1.1 seconds on Easy, every 0.8 seconds on Hard. A corner tag on the top card shows who turned it, and small arrows point to where the next card comes from.
3. Watch for Jacks only — slap the pad the moment one shows: When the top card is a Jack, a gold burst flares in the middle and a gold arc starts draining around the card: that's your signal. The whole slap pad counts and the press registers the instant your finger lands. Win it and the pile flies into your stack, the pad shows your time in milliseconds and +N pops beside your count.
4. Don't get fooled by Queens and Kings — wrong slaps cost a card: Slapping a card that isn't a Jack hands the top card of your stack to your opponent, the status line says "Not a Jack (it's Q) · 1 card", and you're locked for 0.4 seconds. If the computer beats you to a Jack, your slap shows as late by so many milliseconds, with no penalty. A Jack nobody slaps within 3 seconds is covered by the next card.
5. After 12 Jacks the bigger stack wins — then play again: The game ends after the 12th Jack, with one last chance for a player who runs out of cards. The result card shows the card count, Jacks won, your fastest and average slap and your wrong slaps; beating your best reaction lights up New best the moment it happens. Play again deals a fresh deck and Copy game link lets a friend play the same deal.

Rules & variants

Slapjack is a reaction card game and often the very first card game kids learn. It uses one standard 52-card deck without jokers, dealt alternately into two face-down stacks of 26. Nobody looks at their own cards — the whole game is your eyes and your hand.

Players take turns flipping the top card of their stack into a shared center pile. Only one card may be slapped: a Jack. Whoever slaps a Jack first takes the entire center pile and puts it under their own stack. On this page the cards are turned for both sides on a fixed beat, so you only slap — no arguments about peeking or flipping too slowly.

The trap is the wrong slap: slap a card that isn't a Jack and you pay one card from the top of your stack to your opponent. Here a wrong slap also locks you out for 0.4 seconds, so hammering the pad doesn't pay — in more than a thousand simulated games of slapping every 0.2 seconds, the spammer ended up giving away every card.

When two hands hit the same Jack almost together, the earlier press wins to the millisecond; the later one is shown as late by that many milliseconds and costs nothing. If nobody slaps a Jack within 3 seconds, the next card covers it and that Jack counts as unclaimed — it still counts toward the 12.

Traditional Slapjack runs until one player holds all 52 cards, which can take forever. This version adds two endings. First, a cap: after the 12th Jack the player with more cards wins. Second, a last chance: run out of cards and you aren't out yet — slap the next Jack to take the pile and come back, but if your opponent gets it or you slap wrong, you're out. A game usually takes just over a minute.

The computer comes in three levels that differ only in speed and accuracy: Easy reacts in about 0.75–1.15 seconds and sometimes misses, Normal in about 0.52–0.82 seconds, and Hard in about 0.38–0.60 seconds and almost never misses. The computer also gets twitchy on Queens and Kings and slaps wrong now and then — that penalty card comes to you. It only ever sees the card that has just been turned.

Three tips: read the Jack by the shape of its letter, not its suit; Queens and Kings are the cards most likely to fool your hand, so half a beat slow beats a wrong slap; and during a last chance every card your opponent turns could be your comeback, so keep your eyes on the middle.

Slapjack vs Egyptian Ratscrew: Egyptian Ratscrew (also called Egyptian War) adds more slappable patterns such as doubles and sandwiches plus face-card challenges, while Slapjack keeps one simple rule — slap the Jack. Two players can lay one phone flat between them; the top half of the screen turns upside down for the player across the table and each has their own slap pad. Every deal has a game code (for example A1-1K9Z4Q: computer on Easy) that you can share as a link.

FAQ