Stacking & Multi-Char Tiles

Stacking (Upwords-like)

• Enable overlays with CrosswordRules.stacking_enabled = true.
• Constraints:
  • stacking_max_height: limit total tiles per cell.
  • forbid_same_symbol_overlay: prevent overlaying the same visible symbol.
• Scoring modes:
  • TopOnly: only top tile contributes; letter multipliers apply to newly placed tops only.
  • SumStack: sum underlying tiles plus top (with multipliers); word multipliers apply as usual.

Multi-Character / Emoji Tiles

• TileKind.symbol can be any Unicode string (grapheme sequences and ZWJ emoji supported).
• Dictionary engines operate on normalized strings (NFC by default, optional NFKC).
• Move generation treats multi-character symbols as a single tile; cross-checks count tiles, not codepoints.

WASM Playground

• Try the new toggles:
  • “Stacking”: overlay tiles; switch scoring between TopOnly and SumStack.
  • “RTL reading”: reverse horizontal word assembly for dictionary checks.