This repository is a set of contract puzzles intended to work on call
and delegatecall
.
Each solidity file corresponds to a test file with the same index on it. Go through each contract and complete the TODOs to pass the test cases in order to complete all the challenges.
For the sake of the challenges, do not change anything about the test cases before getting them to pass. After you pass the test cases, you're welcome to change them how you'd like!
Open contracts/Contracts1.sol
to check out this first challenge. Inside the Sidekick
contract, you'll see a TODO to alert the hero. Complete this call
to successfully call the Hero's alert
function.
When you have completed this TODO, run the tests with npx hardhat test test/test1.js
.
Open contracts/Contracts2.sol
for the second challenge. This time the Sidekick
will need to alert the Hero
of the number of enemies to expect and whether they are armed or not (oh no)!
When you have completed this TODO, run the tests with npx hardhat test test/test2.js
Open contracts/Contracts3.sol
for the third challenge. Notice that both the Sidekick
and Behavior
are sharing a storage layout in the Storage
contract. For this challenge, use the recordAmbush
function of the Behavior
contract to change storage inside of the sidekick. Ensure that only the headquarters can warn of this ambush, otherwise revert.
When you have completed this TODO, run the tests with npx hardhat test test/test3.js
Open contracts/Contracts4.sol
for the fourth challenge. There's an issue here. The Hero
can be hacked and lose ownership of their contract! How is this happening? Can you spot the bug here and fix it so the Hero can still superCharge
without being hacked?
When you have completed this TODO, run the tests with npx hardhat test test/test4.js
Open contracts/Contracts5.sol
for the fifth challenge. For this challenge, your goal is to help the bad friend in their malicious plan to stop the Hero from connecting to the good friend. If the Behavior
contract sent a delegatecall
into the BadFriend
contract, what kind of damage could be done?
When you have completed this TODO, run the tests with npx hardhat test test/test5.js