This project combines a playable 3×3 Tic-Tac-Toe board, three AI difficulty designs, local two-player mode and a neon-style interface using vanilla HTML, CSS and JavaScript. The practical order is to make the rules work first—board state, legal moves, wins and draws—then add the opponent and visual effects. The feature list comes from the project’s README, so it describes the repository’s design rather than independently verified test results. Project repository
What the game needs to do
Tic-Tac-Toe is played on a 3×3 board. X and O alternate turns; a player wins by filling a complete row, column or diagonal. If all nine cells are occupied and nobody has a winning line, the game is a draw. Code Explained tutorial
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Keep the game state separate from its display. An array of nine entries is enough to represent the board: each entry is empty, X or O. After a move, render that state, then check for a win or draw before allowing another turn. This makes the rules easier to reason about than treating what happens to be on screen as the source of truth.
Build the board and validate moves
Render nine cells
Create a board container and nine selectable cells. The related tutorial uses buttons for cells, which also gives the controls keyboard operation by default. JavaScript Tic-Tac-Toe tutorial A CSS grid is a natural fit for arranging them in three rows and three columns; the board can be rendered again whenever the underlying array changes.
#1 Best Overall
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Accept only legal moves
When a player selects a cell, check that the game is still active and the corresponding array entry is empty. If it is occupied, ignore the input. Otherwise, place the current mark in the array and update the display. This prevents a second click from overwriting a previous move.
Check all win lines and draws
There are eight possible winning lines: three rows, three columns and two diagonals. Check each line after every move. If one contains three matching non-empty marks, end the round; if no line wins and every cell is occupied, end it as a draw. Only switch turns if neither condition has ended the game.
Rank #2
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Add game modes and reset behavior
The repository describes both human-versus-AI and local two-player play, alongside a reset path and difficulty selection. Project repository A reset should clear all nine entries, restore the opening player, and remove any end-of-game state from the interface. In two-player mode, alternate X and O without invoking the AI. In human-versus-AI mode, let the human make a legal move first, then request an AI move only if the round remains active.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Choose how the AI makes a move
The project describes three difficulty levels. These are implementation choices reported by the repository; the README alone does not establish that each mode has been independently tested. Project repository
Rank #3
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| Level | Move strategy | What to expect |
|---|---|---|
| Easy | Random legal move | Simple opponent behavior; it may miss a win or fail to block. |
| Medium | Look for an immediate win, otherwise block an immediate opponent win | Handles obvious tactics, but is not described as evaluating every future line. |
| Hard | Minimax search over possible future states | Chooses an optimal move according to the search design described by the project. |
Why minimax works here
Minimax considers possible future board states: the AI selects a move that gives it the best outcome while assuming the opponent will choose a move that is best for them. Because Tic-Tac-Toe has only nine cells, the possible continuations can be evaluated recursively. A separate tutorial demonstrates minimax with alpha-beta pruning, which cuts off branches that cannot change the decision. JavaScript Tic-Tac-Toe tutorial This is a search algorithm, not machine learning: it does not train a model.
Style the neon interface after the rules work
The project README lists a neon palette, glowing treatment, animated grid, responsive board and interaction effects. Project repository Apply those effects in CSS once moves and outcomes are reliable: use contrast to keep X and O legible, reserve glow for marks or active cells, and make hover and animation states supplementary rather than the only indication of a selection. A responsive grid helps the board fit smaller screens without changing the game logic.
Rank #4
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What you need to follow along
This is a no-framework front-end project; the repository says it requires no paid product, framework or external library. Project repository The tutorials assume familiarity with JavaScript fundamentals such as variables, functions, arrays, loops and conditionals, with DOM manipulation and event listeners relevant to interactive versions. Code Explained tutorial JavaScript Tic-Tac-Toe tutorial The Code Explained article dates to June 2020, so its rules and broad workflow are useful references, not a guarantee that every code detail matches current browser practice.
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Keep score locally
The related tutorial describes saving scores with localStorage. JavaScript Tic-Tac-Toe tutorial That is suitable for keeping scores in the same browser on the same device; it is not shared storage across players or devices. Keep score updates separate from move validation so a round increments a result only once, when the game first reaches a win or draw.
Quick Recap
Best Value
- We took classic Tic Tac Toe and added some action!
- Place the Toss Across unit on a floor, turn all targets blank side up, grab your three bean bags, and get ready to toss!
- Players try to get the rotating triangles to flip to show either X or O. Three in a row wins!
- Toss Across is lots of fun and even helps develop hand-eye coordination. Fun for children and the whole family.
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