Adjustments to Word Games

public/src/games/kiitos/KiitosGame.js

@@ -612,24 +612,30 @@ export default class KiitosGame extends Phaser.Scene {
   promptNameWord(newBuilt) {
     (this.humanBtns ?? []).forEach((b) => b.destroy());
     this.promptTxt.setText(`Name your word — it must start with "${newBuilt}".`);
-    const cy = CENTER_Y + 200;
-    this.humanInput = new TextInput(this, GAME_WIDTH / 2 - 130, cy, {
-      width: 360, height: 56, value: newBuilt.toLowerCase(),
+
+    // Two-row layout: input centered, then Cancel | Announce below.
+    // All three share the same outer extents (cx ± 230) for clean alignment.
+    const cx = GAME_WIDTH / 2;
+    const inputY = CENTER_Y + 196;
+    const btnY = inputY + 72;
+
+    this.humanInput = new TextInput(this, cx, inputY, {
+      width: 460, height: 56, value: newBuilt.toLowerCase(),
       placeholder: `word starting "${newBuilt}"…`, maxLength: 12, autocomplete: 'off',
     });
     this.humanInput.focus();
     this.humanInput.on('keydown', (e) => { if (e.key === 'Enter') this.confirmTentativeWord(); });
 
     this.feedbackTxt?.destroy();
-    this.feedbackTxt = this.add.text(GAME_WIDTH / 2, cy + 60, '', {
+    this.feedbackTxt = this.add.text(cx, btnY + 62, '', {
       fontFamily: 'Righteous', fontSize: '24px', color: THEME.negativeHex,
     }).setOrigin(0.5).setDepth(D.ui);
 
     this.humanBtns = [
-      new Button(this, GAME_WIDTH / 2 + 130, cy, 'Announce', () => this.confirmTentativeWord(),
+      new Button(this, cx + 130, btnY, 'Announce', () => this.confirmTentativeWord(),
         { width: 200, height: 56, fontSize: 24, bg: THEME.accent }).setDepth(D.ui),
-      new Button(this, GAME_WIDTH / 2 - 360, cy, 'Cancel', () => this.cancelTentative(),
-        { variant: 'ghost', width: 150, height: 56, fontSize: 22 }).setDepth(D.ui),
+      new Button(this, cx - 130, btnY, 'Cancel', () => this.cancelTentative(),
+        { variant: 'ghost', width: 200, height: 56, fontSize: 22 }).setDepth(D.ui),
     ];
   }
 

public/src/games/spellingbee/SpellingBeeGame.js

@@ -126,8 +126,9 @@ export default class SpellingBeeGame extends Phaser.Scene {
     this.letters    = data.letters ?? [];
     this.validWords = new Set((data.validWords ?? []).map((w) => w.toUpperCase()));
     this.pangramSet = new Set((data.pangrams ?? []).map((w) => w.toUpperCase()));
+    this.difficulty = difficulty;
     this.maxScore   = data.maxScore ?? 0;
-    this.tiers      = buildTiers(this.maxScore);
+    this.tiers      = buildTiers(this.maxScore, difficulty);
 
     this.buildBoard();
   }

public/src/games/spellingbee/SpellingBeeLogic.js

@@ -2,6 +2,7 @@
 
 // Rank tiers as a fraction of the puzzle's maximum possible score (NYT scale).
 // Queen Bee (100%) is intentionally omitted — Genius is the achievable goal.
+// Genius threshold scales down on easier difficulties so it's actually reachable.
 const TIER_TABLE = [
   { name: 'Beginner',   pct: 0.00 },
   { name: 'Good Start', pct: 0.02 },
@@ -14,6 +15,9 @@ const TIER_TABLE = [
   { name: 'Genius',     pct: 0.70 },
 ];
 
+// Fraction of maxScore required to reach Genius per difficulty.
+const GENIUS_PCT = { easy: 0.40, normal: 0.55, hard: 0.70 };
+
 // Number of distinct letters in a word.
 function distinctCount(word) {
   return new Set(word.toUpperCase()).size;
@@ -33,10 +37,12 @@ export function scoreWord(word) {
 }
 
 // Concrete tier thresholds (rounded score needed to reach each tier).
-export function buildTiers(maxScore) {
+export function buildTiers(maxScore, difficulty = 'normal') {
+  const geniusPct = GENIUS_PCT[difficulty] ?? GENIUS_PCT.normal;
+  const scale = geniusPct / TIER_TABLE[TIER_TABLE.length - 1].pct;
   return TIER_TABLE.map((t) => ({
     name: t.name,
-    threshold: Math.round(t.pct * maxScore),
+    threshold: Math.round(t.pct * scale * maxScore),
   }));
 }
 

server/words/kiitosEngine.js

@@ -12,11 +12,13 @@
 const ABS_MIN = 4;   // shortest legal Kiitos word (round 1 minimum)
 const MAX_LEN = 12;  // cap word length so play stays snappy
 
-let root = null;     // trie root: { word: boolean, kids: Map<char, node> }
-let wordSet = null;  // Set<string> of every legal Kiitos word
+let root = null;        // trie root: { word: boolean, kids: Map<char, node> }
+let wordSet = null;     // Set<string> of every legal Kiitos word
+let commonWordSet = null; // Set<string> of recognizable common words (AI prefers these)
 
 const completionCache = new Map(); // `${prefix}|${minLen}` -> boolean
 const wordCache = new Map();       // `${prefix}|${minLen}` -> string|null
+const commonWordCache = new Map(); // `${prefix}|${minLen}` -> string|null
 
 function makeNode() { return { word: false, kids: new Map() }; }
 
@@ -25,6 +27,7 @@ export function initKiitosDictionary(words) {
   wordSet = new Set();
   completionCache.clear();
   wordCache.clear();
+  commonWordCache.clear();
   for (const raw of words) {
     const w = String(raw).toUpperCase();
     if (w.length < ABS_MIN || w.length > MAX_LEN || !/^[A-Z]+$/.test(w)) continue;
@@ -40,6 +43,18 @@ export function initKiitosDictionary(words) {
   return { words: wordSet.size };
 }
 
+// Called after initKiitosDictionary with words from a frequency-filtered common list.
+// Only words already in wordSet are kept (common list may include short words not in trie).
+export function initKiitosCommonWords(words) {
+  commonWordSet = new Set();
+  commonWordCache.clear();
+  for (const raw of words) {
+    const w = String(raw).toUpperCase();
+    if (wordSet && wordSet.has(w)) commonWordSet.add(w);
+  }
+  return { common: commonWordSet.size };
+}
+
 export const MIN_WORD_LEN = ABS_MIN;
 
 // ── Lookups ─────────────────────────────────────────────────────────────────────
@@ -108,6 +123,30 @@ export function findWord(prefix, minLen = ABS_MIN) {
   return result;
 }
 
+// Like findWord but only returns words in the common word set (AI prefers these).
+// Falls back to null if no common word extends `prefix`.
+function findCommonWord(prefix, minLen = ABS_MIN) {
+  if (!commonWordSet) return null;
+  const key = `${prefix}|${minLen}`;
+  const cached = commonWordCache.get(key);
+  if (cached !== undefined) return cached;
+  const start = nodeFor(prefix);
+  let result = null;
+  if (start) {
+    let frontier = [[start, prefix]];
+    while (frontier.length && !result) {
+      const next = [];
+      for (const [n, s] of frontier) {
+        if (n.word && s.length >= minLen && commonWordSet.has(s)) { result = s; break; }
+        if (s.length < MAX_LEN) for (const [ch, c] of n.kids) next.push([c, s + ch]);
+      }
+      frontier = next;
+    }
+  }
+  commonWordCache.set(key, result);
+  return result;
+}
+
 // ── AI move selection ─────────────────────────────────────────────────────────
 // Returns one of:
 //   { type: 'play', letter, forced: true }            — mandatory next letter
@@ -154,7 +193,7 @@ export function chooseMove({
     if (seen.has(prefix)) return;
     seen.add(prefix);
     if (!hasCompletion(prefix, minLen)) return;
-    const word = findWord(prefix, minLen);
+    const word = findCommonWord(prefix, minLen) ?? findWord(prefix, minLen);
     if (word) cands.push({ letter, prefix, word });
   };
   for (const L of new Set(H)) {

server/words/wordLadderEngine.js

@@ -31,12 +31,26 @@ const SKILL = {
 
 const wordSets = {};   // length → Set<string>
 const wordArrays = {}; // length → string[]
+const commonSets = {}; // length → Set<string> (frequency-filtered subset)
 
 export function initWordLadderDictionary(words3, words4) {
   setFor(3, words3);
   setFor(4, words4);
 }
 
+// Called after the common word list is loaded so puzzle generation can prefer
+// paths where every rung is a recognisable word (not just start and target).
+export function initCommonWordSets(words3, words4) {
+  if (words3?.length) {
+    const arr = words3.map(w => String(w).toUpperCase()).filter(w => w.length === 3);
+    commonSets[3] = new Set(arr);
+  }
+  if (words4?.length) {
+    const arr = words4.map(w => String(w).toUpperCase()).filter(w => w.length === 4);
+    commonSets[4] = new Set(arr);
+  }
+}
+
 function setFor(length, words) {
   const arr = (words ?? []).map(w => String(w).toUpperCase()).filter(w => w.length === length);
   wordSets[length] = new Set(arr);
@@ -70,8 +84,9 @@ export function neighbors(word) {
 }
 
 // BFS from `start`; returns Map<word, distance> over the connected component.
-// `maxDepth` (optional) bounds the search for puzzle generation.
-function bfsDistances(start, maxDepth = Infinity) {
+// `maxDepth` bounds the search for puzzle generation.
+// `nodeSet` restricts traversal to words in that set (for common-only BFS).
+function bfsDistances(start, maxDepth = Infinity, nodeSet = null) {
   const dist = new Map([[start, 0]]);
   const queue = [start];
   let i = 0;
@@ -80,7 +95,7 @@ function bfsDistances(start, maxDepth = Infinity) {
     const d = dist.get(w);
     if (d >= maxDepth) continue;
     for (const n of neighbors(w)) {
-      if (!dist.has(n)) {
+      if (!dist.has(n) && (!nodeSet || nodeSet.has(n))) {
         dist.set(n, d + 1);
         queue.push(n);
       }
@@ -119,14 +134,15 @@ export function shortestPath(from, to) {
 
 // Build a puzzle whose optimal solution is exactly `par` steps. Retries with
 // fresh random starts; relaxes to the deepest reachable target if `par` proves
-// hard to hit for the chosen start.
-function generatePuzzleWithPar(length, par, attempts = 300) {
-  const pool = wordArrays[length] ?? [];
+// hard to hit for the chosen start. When `nodeSet` is provided, BFS and the
+// candidate pool are both restricted to that set so every rung is a word in it.
+function generatePuzzleWithPar(length, par, attempts = 300, nodeSet = null) {
+  const pool = nodeSet ? [...nodeSet].filter(w => w.length === length) : (wordArrays[length] ?? []);
   if (pool.length === 0) return null;
 
   for (let a = 0; a < attempts; a++) {
     const start = randomFrom(pool);
-    const dist = bfsDistances(start, par);
+    const dist = bfsDistances(start, par, nodeSet);
     const exact = [];
     let deepest = null, deepestD = 0;
     for (const [word, d] of dist) {
@@ -151,26 +167,37 @@ function pickPar(length) {
   return lo + Math.floor(Math.random() * (hi - lo + 1));
 }
 
+// Try to generate a common-word-only puzzle first; fall back to the full
+// dictionary if the common subgraph is too sparse or too small.
+function makePuzzle(length, par, nodeSet = null) {
+  if (nodeSet?.size >= 20) {
+    const p = generatePuzzleWithPar(length, par, 200, nodeSet);
+    if (p) return p;
+  }
+  return generatePuzzleWithPar(length, par) ?? fallbackPuzzle(length);
+}
+
 // Single puzzle (solo mode).
 export function generatePuzzle(length) {
   const L = LENGTHS.includes(length) ? length : 4;
-  return generatePuzzleWithPar(L, pickPar(L)) ?? fallbackPuzzle(L);
+  return makePuzzle(L, pickPar(L), commonSets[L]);
 }
 
 // Two distinct puzzles of equal par (versus mode — fair race).
 export function generateVersusPuzzles(length) {
   const L = LENGTHS.includes(length) ? length : 4;
   const par = pickPar(L);
-  const player = generatePuzzleWithPar(L, par) ?? fallbackPuzzle(L);
+  const cs = commonSets[L];
+  const player = makePuzzle(L, par, cs);
   let opponent = null;
   for (let a = 0; a < 20; a++) {
-    const cand = generatePuzzleWithPar(L, player.par);
+    const cand = makePuzzle(L, player.par, cs);
     if (cand && cand.start !== player.start && cand.target !== player.target) {
       opponent = cand;
       break;
     }
   }
-  return { player, opponent: opponent ?? generatePuzzleWithPar(L, player.par) ?? fallbackPuzzle(L) };
+  return { player, opponent: opponent ?? makePuzzle(L, player.par, cs) };
 }
 
 // Degenerate safety net: a start word and one neighbour (par 1). Only reached if

server/words/wordRoutes.js

@@ -6,6 +6,7 @@ import { initScrabbleDictionary, isValidWord, chooseMove } from './scrabbleEngin
 import { initGhostDictionary, judge as ghostJudge, chooseLetter as ghostChooseLetter, suggestWords as ghostSuggestWords } from './ghostEngine.js';
 import {
   initWordLadderDictionary,
+  initCommonWordSets as ladderInitCommon,
   generatePuzzle as ladderGeneratePuzzle,
   generateVersusPuzzles as ladderGenerateVersus,
   chooseAIMove as ladderChooseAIMove,
@@ -22,12 +23,14 @@ import { initBoggleDictionary, rollBoard, solveBoard } from './boggleEngine.js';
 import { initSpellingBeeDictionary, generatePuzzle as spellingBeeGenerate } from './spellingBeeEngine.js';
 import { initMiniCrosswordPuzzles, getPuzzle as miniCrosswordGet } from './miniCrosswordEngine.js';
 import {
-  initKiitosDictionary, isValidKiitosWord, hasCompletion as kiitosHasCompletion,
-  findWord as kiitosFindWord, chooseMove as kiitosChooseMove, MIN_WORD_LEN as KIITOS_MIN,
+  initKiitosDictionary, initKiitosCommonWords, isValidKiitosWord,
+  hasCompletion as kiitosHasCompletion, findWord as kiitosFindWord,
+  chooseMove as kiitosChooseMove, MIN_WORD_LEN as KIITOS_MIN,
 } from './kiitosEngine.js';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const WORDLIST_PATH = path.join(__dirname, '../data/wordlists/enable1.txt');
+const COMMON_PATH = path.join(__dirname, '../data/wordlists/common.txt');
 
 // Common words used to build a player-friendly Wordle answer pool.
 // These are well-known 5-letter English words that make fair Wordle puzzles.
@@ -170,6 +173,21 @@ function loadWordLists() {
   const kiitosStats = initKiitosDictionary(kiitosWords);
   console.log(`[words] loaded ${kiitosStats.words} Kiitos words (4–12 letters)`);
 
+  // Kiitos AI common word preference: load frequency-filtered word list so the AI
+  // targets recognizable words instead of obscure ENABLE entries.
+  try {
+    const commonRaw = fs.readFileSync(COMMON_PATH, 'utf8');
+    const commonWords = commonRaw.split('\n').map(w => w.trim().toUpperCase()).filter(Boolean);
+    const commonStats = initKiitosCommonWords(commonWords);
+    console.log(`[words] loaded ${commonStats.common} Kiitos common words for AI targeting`);
+    const common3 = commonWords.filter(w => /^[A-Z]{3}$/.test(w));
+    const common4 = commonWords.filter(w => /^[A-Z]{4}$/.test(w));
+    ladderInitCommon(common3, common4);
+    console.log(`[words] loaded Word Ladder common words (${common3.length} 3-letter, ${common4.length} 4-letter)`);
+  } catch (err) {
+    console.warn('[words] common.txt not found; Kiitos AI will use full ENABLE list');
+  }
+
   // Answer pool: prefer curated common words that are also in ENABLE;
   // supplement with additional ENABLE words up to a healthy pool size.
   const curated = [...COMMON_WORDS].filter(w => enableFive.has(w));