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SlopeDoku

An OpenDoku game · Open Mirror LLC

Winter brain games in Roman numerals

Every tile is two puzzles — the numeral and the sport must both fit.

Fresh Tracks

Pick an athlete below.
How to play
  • Every tile is two puzzles at once — the numeral and the sport both have to fit. Pick a card below, then tap where it goes.
  • Green: the bunny slope — I, II, III and IV in four different suits. Every card fits anywhere; just learn to pick up and place. The rules kick in on blue.
  • Blue: 4×4 — every row, column and 2×2 box needs each numeral I–IV and each sport once.
  • Black diamond: 9×9, icons only — every row, column and 3×3 box needs all nine winter sports. Big clean tiles, one constraint, real sudoku depth.
  • Double black: the true summit — 9×9 where numerals I–IX AND nine sports are both sudoku-valid at once. Two puzzles in every tile.
  • The lineup is exactly the right cards to finish the board, and you never have to guess — guaranteed. From the first tile to the last, there is always a cell that accepts exactly one of your cards, or a card with only one home. Start where a row, column or box is fullest, and if you can’t see it, 💡 will.
  • A move that breaks the rules — or would make the mountain impossible to finish — gets an , but the card comes back to you to try somewhere else. Mistakes add up: three ✗ in one run and you’re out. Every deal is solvable.
  • 💡 is your coach — it glows a correct card and spot when you’re stuck.
  • Your game saves itself — close the app, come back, keep climbing.

Avalanche

🎯 The goal: keep the mountain from filling up. Matching numerals melt together — merge, score, survive.

❄️ Ready to ride?

Tiles fall onto the mountain, one at a time.

  1. Tap a ▼ lane to drop the tile where you want it.
  2. Touching tiles with the same numeral merge into a bigger one.
  3. Beat the clock — wait too long and the tile drops itself!
How to play
  • The goal is survival: the run ends when the mountain fills to the top. Merging keeps it clear — and scores.
  • Tap a ▼ lane (or anywhere in a column) to drop the tile there before the clock drops it for you somewhere random.
  • Touching tiles with equal numerals merge upward: I+I→II … IX+IX→X. Two X’s vanish in a 💥 for a big bonus.
  • Same-sport merges score double, and every point is multiplied by your level.
  • Every 15 drops = next level — the clock gets a little faster. Keep the rhythm.