Spreadsheet Blackjack is a free unblocked blackjack game that runs entirely in your browser — no download, registration, or install required. The interface is disguised as a spreadsheet grid, making it discreet enough for a quick round at work or school. Behind the familiar rows and columns lies a full-featured blackjack simulator with configurable rules, a card counting trainer, and keyboard shortcuts.
Use the built-in card counting trainer to practice Hi-Lo, Zen Count, Omega II, and other popular systems in real time. Adjust the number of decks, toggle splitting and doubling rules, or enable Double Down Madness for a higher-stakes challenge. A boss key (press H) hides the game instantly behind an innocent spreadsheet, and keyboard betting shortcuts (J/K for step up/down, U/M for min/max) let you play without touching the mouse.
Yes. Spreadsheet Blackjack is completely free to play. There are no ads, microtransactions, or hidden fees. The entire game runs client-side in your browser — zero server calls, zero tracking.
Yes. The game includes a card counting trainer that supports Hi-Lo, KO, Omega II, Zen Count, Red 7, and Halves. The running count and true count are displayed directly in the grid, so you can verify your mental count with every hand — useful for both beginners learning the system and experienced players staying sharp.
Configure bankroll size, min/max bets, number of decks (1–12), splitting, doubling, double after split (DAS), max split hands, re-splitting aces, ace-split-one-card-only, and Double Down Madness mode. Every rule change takes effect immediately on the next round.
Press H at any time to hide the game behind a normal-looking spreadsheet. All game state is preserved — press H again to resume exactly where you left off. The boss key works even when the game is hidden, meaning a second tap brings it straight back with no awkward delay.