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Frequently Asked Questions

Everything about playing BlinkSum, its rules, and the four special cards.

General

What is BlinkSum?
BlinkSum is a free, real-time multiplayer card game. Each turn players flip a card; the moment any color’s cards on the field total the target (5), the first player to ring the bell wins those cards. It follows the classic bell-racing tradition, with four special card types of its own.
Is BlinkSum free to play?
Yes. There is no sign-up, no payment, and no download. Open the site and play.
Do I need an account or an app?
No. BlinkSum runs in any modern web browser — no account and no installation.
What devices does BlinkSum work on?
Any modern browser on phone, tablet, or desktop. The layout adapts to both mobile and desktop screens.
How many players can play?
Two to four players per room, and you can fill empty seats with bots.
Can I play alone or against bots?
Yes. “Play vs Bots” on the home screen starts a solo practice game against bots instantly — no room setup needed.
Is BlinkSum like other bell-racing card games?
It shares the classic bell-racing feel — spot the moment and be first to the bell — but it is its own game. BlinkSum uses a sum-to-target rule (make one color total 5) and adds special cards (Gold, Gem, Ice, Prism), so the tactics differ.

Rules & Scoring

How do you win a game of BlinkSum?
You win by outlasting everyone. A player is eliminated when their deck runs out of cards. The last player still in the game collects all remaining cards and wins.
What is the target sum?
The target is 5. A correct bell requires a single color’s cards on the field to total exactly 5. Hidden Gem cards still count, and Prism can add to a color that already has cards on the field.
What is the penalty for ringing the bell when the sum is wrong?
You give one card from your deck to each opponent, and your own bell is locked for a short cooldown (about 2.5 seconds). In a four-player game a wrong bell costs you three cards, so guess carefully.
Who wins when two players ring the bell at the same instant?
The server decides using the first bell event it receives, so timing is server-authoritative and the same source of truth for everyone. Network latency can influence who arrives first.
How long does a game usually last?
Most matches finish in about 3 to 8 minutes, depending on the number of players and how aggressively people ring the bell. There is no fixed turn limit.

The Four Cards

How do the four card types work?
Gold: its value is always visible. Gem: it flashes briefly, then hides — you must remember its value. Ice: it loses one value every turn. Prism: a wildcard that boosts colors already on the field.
How does the Prism card work?
Prism adds its value to colors that already have a card on the field (Gold, Gem, or Ice). It cannot complete an empty color by itself. Only when every card on the field is Prism does the Prism total count on its own.
What happens to an Ice card when its value reaches 0?
A 0-value Ice card no longer contributes to the Ice sum. It is treated as gone for scoring, even if its visual placeholder lingers for a moment.
Why did the Gem card disappear?
Gem cards are shown only briefly, then hidden — that is the memory element. The value still counts until the card is replaced, so note it the instant it appears.

Technical

Can I rejoin a game after disconnecting?
Yes. Your room code and name are saved in your browser, so refreshing or revisiting reconnects you to the same room and seat.

New here? Start with the How to Play guide, or dig into the Strategy Guide.