Click to earn coins, buy upgrades, then refresh the page. That's the Kill Test: everything comes back because it's saved in localStorage.
Saving is blocked on this page, so your progress will reset when you leave. Open the game in its own tab to save.
Your coins
Upgrade shop
Save file (localStorage, live)
| Tag | Value (saved as text) |
|---|
Teacher controls
Every click, purchase, and tick is saved.
Turn saving off, earn some coins, and refresh. The game forgets everything after the last save, just like the Goldfish app.