Ready Gladiator 1 | picoCTF 2023 Solutions

Description

Now you must occasionally beat the Imp. Modify the warrior to something more aggressive, such as the documented “Imp Ex” example.

Setup

Replace the original Imp with a more capable warrior (e.g., add #4, mov 2,@2, jmp -2).

Submit the modified file via nc saturn.picoctf.net 63042 and win at least one round.

cat <<'RED' > imp.red ;redcode ;name Imp Ex add #4, 3 mov 2, @2 jmp -2 dat #0, #0 end RED

nc saturn.picoctf.net 63042 < imp.red

Step 1Adopt a published warrior
The “Imp Ex” sample from the CoreWar docs overwhelms the stock Imp within a few rounds, guaranteeing at least one victory.
Step 2Collect the reward
Once the 100 matches finish, the service reveals the flag in the summary output.

picoCTF{1mp_1n...5_ec57a42e}

Any warrior capable of beating the Imp at least once will work; Imp Ex is a handy template.