Game guide

How to Play

Fill every empty square with 0 or 1 while following all three rules.

Binary Sudoku

Rules

Each row and column contains the same number of 0s and 1s.
Never place three identical numbers together.
No two completed rows or columns can be identical.

Controls

Tap a square and choose 0 or 1. Tapping the selected square cycles through its values. Use Undo or Erase to correct a move. Check marks incorrect entries without revealing the answer; Clear Errors removes only entries identified by the latest check.

Assistance

Rule warnings, remaining counts, matching-value highlights, opposite-pair highlights, and Explain One Move can be enabled separately. Only value hints and deliberate uses of Explain One Move are recorded in your result; display preferences are not counted.

Classic Sudoku

Fill the 9x9 grid so every row, column, and 3x3 box contains the numbers 1 through 9 exactly once.

Use each number from 1 through 9 once in every row.
Use each number from 1 through 9 once in every column.
Use each number from 1 through 9 once in every 3x3 box.

Select a square and enter a number. Turn on Notes to record candidates without filling the square.

Meowdoku

Place every cat using rows, columns, colored territories, and the no-touching rule.

Place exactly one cat in each colored region.
Each row and each column must contain exactly one cat.
Cats cannot touch one another, including diagonally.

Tap a cell to cycle through cat, exclusion mark, and empty.

Blackjack

Play with fictional chips, learn basic strategy, and keep your history without real-money gambling.

The dealer stands on all 17s, including soft 17.
A natural Blackjack pays 3:2. Insurance pays 2:1.
Double on any first two cards, including after a split.
Split to a maximum of four hands. Split Aces receive one card each and cannot be resplit.
Late surrender is offered on the first two cards when available.
Play one or two starting hands. The minimum and maximum per hand are 5 and 500 fictional chips.

Best Move uses six-deck basic strategy for these exact rules. It is optional and its use is shown in your history.

Poker

Choose a quick casino table game, video poker, or a full poker hand against computer opponents.

Caribbean Stud

Play one-deck Caribbean Stud against the dealer with fictional chips and an optional progressive side wager.

You and the dealer receive five cards from one 52-card deck. Only one dealer card is shown before your decision.
Fold to lose the Ante, or Call by placing exactly twice the Ante.
The dealer qualifies with Ace-King high or better. If the dealer does not qualify, the Ante wins 1:1 and the Call is returned.

Caribbean Draw Poker

You and the dealer receive five private cards from one 52-card deck.
Fold to lose the Ante, or Call by adding exactly twice the Ante.
After calling, replace zero, one, or two cards. The dealer then follows fixed draw rules.
The dealer qualifies with a pair of eights or better. Winning Ante and Call wagers follow the displayed table rules.
The optional progressive wager is evaluated from your original five cards before replacements.

Jacks or Better

Choose one through five coins, then receive five cards from a 52-card deck.
Select any cards to hold. Every card not held is replaced once.
A pair of Jacks or better wins according to the full-pay 9/6 table.
Five coins unlock the 4,000-coin Royal Flush award.
Suggested Move offers a practical hold recommendation and is recorded in statistics.

Texas Hold'em Practice

Each player receives two private cards. Five community cards appear across the flop, turn, and river.
The table uses 5/10 blinds and fixed-limit betting with up to four bets per street.
Check, call, raise, or fold when it is your turn. Computer players act automatically.
The best five-card hand made from seven available cards wins the pot; equal hands split it.
Difficulty changes computer-player discipline and bluff frequency, not the cards.

Five-Card Draw

Four players ante five chips and receive five private cards.
After the first betting round, active players may replace up to three cards.
A second fixed-limit betting round follows the draw.
The highest standard five-card poker hand at showdown wins the pot.
Computer players vary their drawing, betting, and bluffing by difficulty.

All chips are fictional. They have no monetary value and cannot be purchased, sold, or redeemed.

Guest and account play

Guests can play 6x6 Easy and keep one unfinished puzzle in the current browser. A free account unlocks larger boards, harder levels, multiple saved games, Daily Challenges, streaks, history, and statistics across devices.