Jump-In Duel
Two players, jump-in on, Ruthless reflexes. A web-exclusive mode — Free in your browser, no download.
About Jump-In Duel
Jump-In Duel: Two players, jump-in on, Ruthless reflexes. House Rules tables are new on the website: the table rules people argue about at home, built into the engine so nobody has to referee.
The table
2 players: you and 1 computer rival. Everyone starts with 7 cards.
Ruthless rivals read the table: they aim draw cards at whoever is closest to winning, freeze and flip to protect their lead, swap into small hands and fire a Riot Burst the moment it charges.
The deck
The table uses the 126-card Prism deck: numbers 0–9 in four energies (Flare ▲, Surge ●, Volt ◆, Void ■), two each of FLIP, FREEZE, +2, SHIELD and SWAP per energy, 6 PRISM wilds and 4 +4 wilds.
How a turn works
On your turn, play one card that matches the active energy (colour) or the symbol of the top card. Wild cards play on anything and you choose the next energy.
Can't play? Draw one card and your turn passes.
Special rules at this table
- Stacking: answer a +2 with a +2 or a +4 with a +4 to pass the growing pile to the next player. The first player who can't stack draws it all.
- SHIELD cards stay in front of you and block the next draw attack aimed at you, however big it is.
- The Riot Meter charges with every card you play; combos charge it faster. At 100% hit RIOT BURST to shatter up to 2 number cards of the active energy at once.
- Jump-In: if you hold the exact same card as the top card — same energy, same symbol — slam it down out of turn. Play continues from you.
- Last Card Call: when you go down to one card you must press LAST CARD. Forget, and anyone can catch you before the next play — you draw two. Catch rivals who forget!
How to win
Be the first to shed every card. Your score is 100 for the win plus the points left in your rivals' hands, a speed bonus for quick wins, 25 per Riot Burst, a combo bonus and 50 extra for winning without drawing a single card.
Tips for Jump-In Duel
- Watch the top card on every turn. Identical cards glow gold when you can jump in — it steals the turn order and can skip a rival about to win.
- Call LAST CARD before you play your second-last card — then nobody can catch you. And keep an eye on rival hands: a ❗ means they forgot.
- Charge the meter with combos. Several plays in a row fill it faster; burst when it shatters your highest-point number cards.
- Play a SHIELD early when your hand is large — it waits in front of you and eats the next +4 or +10.
- This mode trains speed on your skill radar and pays ×1.35 XP.
Rule guides for this mode
Frequently asked questions
Is Jump-In Duel free to play?
Yes. Jump-In Duel and every other Prism Riot mode are free in your browser with no download, no sign-up and no account. Progress is saved in your browser.
Can I play Jump-In Duel offline?
Yes. After your first visit Prism Riot works offline — add it to your home screen from the browser menu and it opens like an app.
How many players are in Jump-In Duel?
2 players: you against 1 computer opponent at ruthless difficulty. Each starts with 7 cards.
Can you stack draw cards?
Yes, +2 on +2 and +4 on +4. A +4 cannot be stacked on a +2 here (it can in Mayhem and the Merciless modes).
Can I challenge a friend on the same deal?
Yes. After a round, tap “Challenge a friend” — the link opens the exact same shuffle for them, with your score to beat.
Is this mode in the app?
Not yet — it is one of the web-exclusive modes on playprismriot.com, alongside Jump-In, Last Card Call, Doubles, House Party, the Endless Gauntlet and the Daily Duel.