Ethernaut Challenges

Challenge	Writeup	Level	Difficulty	Key Field
	Fallback	Level 1	Easy	JSON RCP & External Calls
	Fallout	Level 2	Easy	Same Object Definition
	Coin Flip	Level 3	Easy	Source of Randomness
	Telephone	Level 4	Easy	tx.origin Attacks
	Token	Level 5	Easy	Integer Overflow & Underflow
	Delegation	Level 6	Easy	delegatecall Attacks
	Force	Level 7	Medium	Forcing Smart Contracts
	Vault	Level 8	Easy	Accessing Private Variable In Storage
	King	Level 9	Medium	Uncheck Calls Returns Value
	Re-entrancy	Level 10	Medium	Reentrancy
	Elevator	Level 11	Easy	Missing State-Modifying Functions
	Privacy	Level 12	Medium	Accessing Private Variable In Storage
	Gatekeeper One	Level 13	Hard	Explicit Conversions & Bitmasking
	Gatekeeper Two	Level 14	Medium	Inner Workings Of Contract Creation & Bitwise Operations
	Naught Coin	Level 15	Medium	ERC-20 Token Standard
	Preservation	Level 16	Hard	Context-Preserving Delegation to On-Chain Libraries & Storage Layout Vulnerability
	Recovery	Level 17	Medium	Contract Address Calculating
	Magic Number	Level 18	Medium	Raw EVM Bytecode
	Alien Codex	Level 19	Hard	Dynamic Array Underflow & First Underhanded Solidity Contest
	Denial	Level 20	Medium	Unlimited call() Method
	Shop	Level 21	Easy	Ternary Operators
	Dex	Level 22	Easy	Swap Price Calculating
	Dex Two	Level 23	Easy	Swap Price Calculating
	Puzzle Wallet	Level 24	Hard	Storage Collision & Upgradeable Contracts & Proxy Pattern
	Motorbike	Level 25	Medium	EIP-1967 & Uninitialized UUPS Proxy Implementation
	Double Entry Point	Level 26	Easy	Calldata Structure