Mastermind Cache Builder
Make your own Mastermind code-breaking cache with a sharable play link.
Mastermind is a code-breaking game. You pick a secret code of coloured number pegs. A player guesses a code and is told how many pegs are the right number in the right spot, and how many are the right number in the wrong spot, narrowing it down until they crack it. Solving it reveals your final coordinates or keyword. The code and the final answer stay on the server, scored guess by guess, so nothing is hidden in the page for a player to peek at.
Save this link now. Without the key you cannot edit or delete this puzzle (only the site admin can reset it).
Your puzzle
Shown to players as a link to your cache page.
Tap a colour to fill the next slot, or tap a filled slot to clear it. Players never see this, they crack it by guessing.
A fresh random code is generated for every player, so each person gets a different puzzle. Cracking any of them reveals the cache. The code is made on the server and never sent to the browser.
How many tries before the board resets (6 to 15). They can try again, the code stays the same.
On solve, reveal
Shown only after a player cracks your code. Fill in at least one.
Where can I host an image for free?
Paste a direct https:// link to an image. Free image hosts that give a direct link include
ImgBB,
postimages.org, and
Cloudinary.
A geocaching.com image link works too. The link must start with https://.