Beggar-My-Neighbour with slapping: answer the pay cards, slap every Double and Sandwich first, and collect the whole pack.
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How to play
Egyptian War is played here by four players, you against three computer players, West, North and East, with a standard 52-card pack. The cards are dealt out, thirteen each, and everyone keeps their cards in a face-down pile without looking at them. Going clockwise, each player turns the top card of their pile face up onto a pile in the centre.
Aces, Kings, Queens and Jacks are pay cards. When one is turned, the next player must answer it by turning up to 4 cards for an Ace, 3 for a King, 2 for a Queen or 1 for a Jack.
If one of those cards is itself a pay card, the payment stops and the next player must answer the new pay card. If none of them is, the player who turned the last pay card wins the whole pile and turns the next card.
At any moment anyone may slap the pile when there's a Double (the top two cards the same rank) or a Sandwich (the top card the same rank as the card two below it, with one card between). The first to slap wins the pile and turns next.
Slap when there's no Double or Sandwich and you burn your top card, face down under the pile.
If you run out of cards you stop turning, but you can still slap a Double or Sandwich to get back in. If the player paying runs out, the next player carries on with the chances that are left; if that would be the player who turned the pay card, they take the pile. A player with no cards who slaps wrongly is out at once (Wikipedia mentions a gentler version with three strikes).
The player who collects all 52 cards wins.
Controls
When it's your turn, or you're answering a pay card, your deck is highlighted: tap it, or press Enter, to turn your card.
To slap, tap the centre pile, tap the SLAP! button, or press Space. The top three cards of the pile are shown, so you can spot a Sandwich.
CPU speed (practice games only) sets how quickly the computer players slap: Slow, Normal or Fast. The daily game is always Normal.
Game modes
Daily: everyone gets the same deal each day, against the same CPU reactions.
New Game: a fresh game with a new deal.
Scoring
Win and you score up to 2,000 points, less 2 for each second the game takes and 20 for each wrong slap (never less than 500 for a win). If you lose, you score 25 for each pile you slapped first.
Tips & strategy
Watch the card two below the top, not just the top two: Sandwiches are easy to miss.
A pile won by slapping is often bigger than one won by a pay card, because the slap can come in the middle of a long challenge.
Don't slap on a near miss, such as a 7 on an 8. A wrong slap gives a card away to the pile.
Origins
Egyptian Ratscrew, often shortened to ERS and also known as Egyptian War, Bloodystump, Ratslap or Slap, is according to Wikipedia a modern American card game, popular among children. Wikipedia says it resembles the 19th-century British game Beggar-My-Neighbour, and pagat.com that it is based on it, with the extra element of slapping certain card combinations, an idea Wikipedia suggests may have been borrowed from Slapjack. Players agree beforehand which combinations may be slapped; the Double is the simplest and the most common. We call the game by its alternative name, Egyptian War. The turning and paying rules here follow pagat.com's description of Beggar My Neighbour, and the slapping rules Wikipedia's Double and Sandwich, written in our own words. Pagat.com's Egyptian Ratscrew page lists the game's other names.
About Egyptian War
Egyptian War is a free browser version of the classic slapping card game, played against three computer players at the speed you choose, with a daily game and online leaderboards. There's nothing to download and no sign-up.
A free, original browser game on PlayPendium. No download, no install.