EVM
nahamcon ctf - The challenge is to bypass the impossible conditions with the help of a function which alters the memory to point to a different jump location
EVM
la ctf - the challenge is to call the Setup contract using another deployed contract which lets you execute one opcode for each call with a weird behaviour of functions inside assembly.
EVM
tet ctf - This challenge contains both web and web3 part in it. The web3 contains a simple re-entrancy.