Clear rules for every game on this site. Jump to a section or open the matching setup screen when you are ready to play.
Tic-Tac-Toe
Two players take turns on a 3×3 grid. One uses X, the other O. The first to place three in a row (horizontal, vertical, or diagonal) wins. If every cell is filled with no winner, the game is a draw.
Setup
Use a single 3×3 board.
Agree who plays X (traditionally first) and who plays O.
Alternate turns; each move must go into an empty cell.
Quick tactics
Center control: the middle square joins the most winning lines—fight for it when it fits your plan.
Threats first: block any opponent line that would win on their next move before building your own trap.
Forks: create two winning threats at once so your opponent can only block one.
Two players drop discs into a vertical grid—on DoStrike the board is 7 columns × 6 rows. Gravity pulls discs to the lowest free cell in the chosen column. The first player to create a straight line of four of their own discs (horizontal, vertical, or diagonal) wins. If the grid fills with no four-in-a-row, the game is a draw.
How a turn works
Choose a column that still has empty space.
Your disc falls to the lowest available slot in that column.
Watch for immediate wins or blocks—Connect 4 punishes missed defenses quickly.
Beginner priorities
Central columns: they participate in more potential four-in-a-row lines than edge columns.
Playable cells: a diagonal or horizontal threat only matters if the winning cell can actually land when you need it—think gravity.
Plan two plies: ask what your opponent's best reply is before you commit.
Cards start face-down. Each turn you flip two cards:
If they show the same symbol, they stay revealed (or leave the board) and you gain a pair.
If they differ, they flip back—remember positions for later turns.
The round ends when every pair is found. On DoStrike you can switch Easy / Medium / Hard layouts—the harder presets use more pairs and a wider grid. Track moves and time to beat your personal bests.
Practical tips
Scan in order: move left-to-right, top-to-bottom so you never skip unknown cards randomly.
Zones: mentally quarter the grid—remember “which quadrant held which icon”.
Accuracy before speed: fewer mistaken repeats lowers your move count automatically.