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Test your math skills in an exciting FPS! Find the correct door to move forward. 100 islands await you with addition, subtraction, division, and multiplication. Hurry, the clock is ticking, and watch outeach island holds new challenges.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
Steam Train Fest starts Jul 20, 2026
Find the right door to move on. You need to focus not only on the math problems, but also on the islands. Once you find the right door and open it, the island will disappear, leaving only a small island under your feet. Move on from there.
Time is also working against you. Every time you open the correct door, you get extra time, but if you open the wrong one, you lose time.
The math problems also get harder and change.
Moving across the islands will also become more and more difficult.
Your agility, speed, and math knowledge will all be challenged!
Lowest tracked price: CA$1.29 (Jul 7, 2026) · current best: CA$1.29.
100% positive reviews all-time.
Right now the cheapest offer for How Much Is ? is CA$1.29 at Steam. KingsPrice compares 1 offers from 1 stores — official stores and keyshops — and refreshes prices throughout the day.
The lowest price KingsPrice has tracked for How Much Is ? is CA$1.29 (recorded on Jul 7, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.
Create a free price alert on this page and KingsPrice will email you when How Much Is ? drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.
