Merciless Knockout
Elimination rounds with the Merciless pack. Free in your browser, no download.
About Merciless Knockout
Merciless Knockout: Elimination rounds with the Merciless pack. Extreme tables add one of the three rule packs — Merciless, Eclipse or Eruption — or throw all of them at once.
The table
4 players: you and 3 computer rivals. Everyone starts with 7 cards.
Sharp rivals shed high-value cards first, save their wilds for the end and keep the colour they hold most of alive. They are the standard opponent.
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.
The Merciless pack adds +6, PURGE and FREEZE ALL in every energy, plus wild +10, REV +4 and ROULETTE cards.
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 with cross-stacking: answer any +2 or +4 with another draw card — including a +4 on a +2 — and the whole pile moves on to the next player.
- 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.
- Mercy rule: reach 25 cards in hand and you are knocked out of the round. The last player standing wins if nobody sheds first.
How to win
Elimination: after every round, the player holding the most points is knocked out. Survive round after round until you are the last one standing.
Tips for Merciless Knockout
- Keep your hand small. With the mercy rule a single +10 on a big hand can knock you out — PURGE and FREEZE ALL are your escape hatches.
- 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 defense on your skill radar and pays ×1.9 XP.
Frequently asked questions
Is Merciless Knockout free to play?
Yes. Merciless Knockout 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 Merciless Knockout 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 Merciless Knockout?
4 players: you against 3 computer opponents at sharp difficulty. Each starts with 7 cards.
Can you stack draw cards?
Yes — +2 on +2, +4 on +4 and, at this table, +4 on +2 as well. The pile keeps growing until someone can't answer.
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.