Quiz

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Pick the right answer for each question (tick all that apply where boxes are shown). Pass mark 80%.

1. Which method of GameModule applies a player's op? view apply end_block id

2. What happens to a transaction's writes when `apply` returns Err? They are kept Only the escrow moves are kept They are all discarded, but the tx still lands in a block with a failed receipt The block is rejected

3. Why must apply be deterministic? To make blocks smaller Because every node replays the chain and must reach the same state roots Because players can see the code Because GOLD has 2 decimals

4. How does tic-tac-toe get a game id? An incrementing counter The first 16 hex characters of the create tx's txid A random number from the OS The creator's address

5. Where does tic-tac-toe hold the stakes while a game is running? In the sequencer's wallet In each player's account, locked In the escrow account `module:tictactoe` In the browser

6. What is the largest stake tic-tac-toe accepts? 1 GOLD 100 GOLD 1000 GOLD (100000 base units) No limit

7. How is the 150-block move timeout measured? With the system clock With ctx.height(), compared to last_move_height + 150 With the browser's timer With the Divi block hash

8. Which error fits a player moving when it is not their turn? ActionError::not_found ActionError::unauthorized ActionError::Internal None; the move is just ignored

9. Your module's `ctx.put("game/ab", ...)` is stored under which key? game/ab m/<module id>/game/ab bal/<module id>/game/ab acct/<module id>/game/ab

10. What is needed to make a new game known to the node? A change to dg-chain's executor One file implementing GameModule and one line in dg_games::all() A new HTTP route A governance vote