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Solidity
75 challenges · Practitioner to Specialty
5 Easy
2 Medium
68 Hard
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All Solidity challenges
Solidity: what is solidity
Easy
Free
+10 XP
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Solidity: compiles to
Medium
Free
+15 XP
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Solidity: pragma
Medium
Free
+15 XP
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Solidity: contract keyword
Easy
Free
+10 XP
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Solidity: state variable
Hard
Free
+20 XP
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Solidity: function
Easy
Free
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Solidity: public
Hard
Free
+20 XP
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Solidity: private visibility
Hard
Free
+20 XP
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Solidity: view
Hard
Free
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Solidity: pure
Hard
Free
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Solidity: payable
Hard
Free
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Solidity: EVM target
Easy
Free
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Solidity: uint
Hard
Free
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Solidity: address type
Hard
Free
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Solidity: bool
Easy
Free
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Solidity: mapping
Hard
Free
+20 XP
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Solidity: struct sol
Hard
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Solidity: array sol
Hard
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Solidity: constructor
Hard
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Solidity: msg.sender
Hard
Free
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Solidity: msg.value
Hard
Free
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Solidity: require
Hard
Free
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Solidity: revert
Hard
Free
+20 XP
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Solidity: assert
Hard
Free
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Solidity: modifier
Hard
Free
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Solidity: onlyowner
Hard
Free
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Solidity: event
Hard
Free
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Solidity: emit
Hard
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Solidity: event use
Hard
Free
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Solidity: memory
Hard
Free
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Solidity: storage location
Hard
Free
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Solidity: calldata
Hard
Free
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Solidity: gas cost storage
Hard
Free
+20 XP
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Solidity: gas view
Hard
Free
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Solidity: inheritance sol
Hard
Free
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Solidity: interface sol
Hard
Free
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Solidity: abstract sol
Hard
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Solidity: library
Hard
Free
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Solidity: safemath
Hard
Free
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Solidity: reentrancy sol
Hard
Free
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Solidity: checks effects
Hard
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Solidity: reentrancy guard
Hard
Free
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Solidity: tx.origin
Hard
Free
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Solidity: selfdestruct
Hard
Free
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Solidity: fallback
Hard
Free
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Solidity: receive
Hard
Free
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Solidity: transfer method
Hard
Free
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Solidity: call value
Hard
Free
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Solidity: overflow default
Hard
Free
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Solidity: constant immutable
Hard
Free
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Solidity: erc20 sol
Hard
Free
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Solidity: openzeppelin
Hard
Free
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Solidity: mapping default
Hard
Free
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Solidity: enum sol
Hard
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Solidity: block.timestamp
Hard
Free
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Solidity: gas limit sol
Hard
Free
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Solidity: external vs public
Hard
Free
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Solidity: immutable set
Hard
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Solidity: withdraw pattern
Hard
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Solidity: delegatecall
Hard
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