Build it. Prove it. Fill the line.

Connect a wallet (top right) to track your progress and submit. Reading the tutorials needs nothing at all.

1. Assignment 01 · Vault

   Cap what a vault can pay out in one transaction.

   The vault works. It has no limits. Add a per-transaction withdrawal ceiling — stored in state, set at initialize, enforced on withdraw — then prove it with tests.

   Beginner–Intermediate2–4 hoursAnchor 1.1.2 · LiteSVM9 checkpoints

   Challenge!
2. Assignment 02 · Escrow

   Make an offer the maker cannot instantly retract.

   The escrow lets a maker cancel the moment anyone tries to take their offer. Stamp each escrow with its creation time, hold cancellation shut for five minutes, and write the tests that prove both sides of that line.

   Intermediate3–5 hoursAnchor 1.0 · SPL Token9 checkpoints

   Challenge!
3. Assignment 03 · Token-2022

   Ship a token that says what it is.

   The mint in this repo has no name, no symbol, no picture, and no way to put tokens in anyone's hands. Give it an identity, pick one more extension that fits the story, mint to two wallets, and prove all of it with tests.

   Intermediate4–6 hoursAnchor 1.0 · Token-20229 checkpoints

   Challenge!
4. Assignment 04 · Fundraiser

   Ship a feature nobody specified for you.

   The fundraiser collects contributions, pays out on success and refunds on failure. It does nothing else. Pick one feature worth adding — milestones, lottery tickets, receipts, rewards, or your own — design the state it needs, build it, and write the three tests that prove it: the happy path, the boundary, and the abuse case.

   Advanced6–10 hoursAnchor 1.1 · SPL Token · TypeScript tests8 checkpoints

   Challenge!