Gomoku Lite

Gomoku Lite — Five in a Row, Minimized

Gomoku Lite distills the classic five-in-a-row strategy game into a focused 9×9 board experience with a clean Minimalist White aesthetic. Play black against a heuristic AI playing white — first to line up five stones horizontally, vertically, or diagonally wins.

Gameplay
- 9×9 board with stones placed on intersections
- Player plays Black and moves first; AI plays White
- Win by forming an unbroken line of five in any direction (horizontal, vertical, two diagonals)
- Draw if the board fills with no winner
- Last move highlighted with a subtle blue dot
- Winning line highlighted in green across the five stones

AI Opponent
- Heuristic scoring AI: evaluates every empty intersection along 4 directions
- Pattern scoring table: open four (100000), four (10000), open three (1000),three (100), two (100),etc.
- Forced-move detection: instantly takes a winning move or blocks the opponent's winning move
- Center-preference bonus to encourage central play
- Millisecond response,suitable for a "Lite" difficulty

Undo System
- 3 free undos per game (rewinds both player's and AI's last moves)
- When undos run out,watch a rewarded ad to gain 3 more
- Undo usage is tracked per game (affects the "Flawless" achievement)

Visual Design: Minimalist White Theme
- Warm off-white background (#FAFAFA),pure white board surface (#FFFFFF)
- Charcoal black primary (#212121) representing black stones
- Medium gray grid lines (#9E9E9E) for restrained contrast
- Restrained blue highlight (#1976D2) for last-move marker
- Forest green (#2E7D32) for winning line,deep red (#C62828) for errors
- Black stones: solid black,no stroke; white stones: white fill with gray stroke
- Gentle & Breathing animation tone (300–400ms,AccelerateDecelerate)
- sans-serif for text,sans-serif-medium for numbers
- High contrast: body text 13.6:1 (AAA), meets WCAG AA+

Pages & Navigation
- HomeActivity: hero section with black+white stone logo,large Play CTA, 2×2 tile grid (History / Stats / Achievements / How to Play),full-width Settings card; double-back-press to exit
- GameActivity: centered toolbar, turn indicator, move counter,9×9 GridLayout board, Undo/Restart buttons,undos-left counter
- HistoryActivity: RecyclerView of past games (result icon, "Black wins · 42 moves", relative time),empty state
- StatisticsActivity: Total Games hero card, Win Rate with progress bar, Wins/Losses/Draws three-color cards (green/red/gray), Current/Best Streak dual cards, Avg Moves
- AchievementsActivity: RecyclerView of 8 achievements with unlock status and counter in toolbar
- HowToPlayActivity: 🎯 Goal / 📜 Rules / 💡 Tips sections with tasteful emoji
- SettingsActivity: Sound / Vibration / Show Move Numbers toggles, Theme info, Version
- Multi-Activity navigation (no bottom tab); secondary pages return to home via toolbar back; game page shows confirm dialog on back

Custom Dialogs
- GameOverDialog: result icon, H1 title (You Win / AI Wins / Draw), subtitle (moves + duration), New Game / Back to Home buttons; back-press closes as Home
- ConfirmDialog: title + message + Cancel/Confirm, used for Restart and Exit confirmations
- CardView-based rounded corners with 8dp elevation, 86% screen width, WRAP_CONTENT height

Achievement System (8 achievements)
- First Win, Ten Wins, Fifty Wins
- Hot Streak (5-win streak)
- Quick Win (win in 15 moves or fewer)
- Flawless (win without using any undo)
- Even Match (end a game in a draw)
- Regular (play 25 games)
- Unlock state persisted to SharedPreferences; toolbar shows "X / 8 unlocked"

Ad Integration
- TradPlus SDK integrated through an independent tradplus-sdk module
- 12 supported ad networks: AdMob, Meta, Unity, Mintegral, Pangle, AppLovin, IronSource, Vungle, Chartboost, InMobi, Tapjoy, Maio
- Interstitial ads: shown after game over when user taps New Game or Back to Home — capped at 1 per session
- Rewarded ads: shown when undo count reaches 0 and user taps Undo — grants +3 undos; capped at 1 per session