To solve this level, you only need to provide the Ethernaut with a Solver, a contract that responds to whatIsTheMeaningOfLife() with the right 32 byte number.
Easy right? Well... there's a catch.
The solver's code needs to be really tiny. Really reaaaaaallly tiny. Like freakin' really really itty-bitty tiny: 10 bytes at most.
Hint: Perhaps its time to leave the comfort of the Solidity compiler momentarily, and build this one by hand O_o. That's right: Raw EVM bytecode.
Good luck!