Complete the secret agent's mission debrief.

I came prepared with all my gadgets to bypass the laser grid, but I ______ the vault's passcode after all. Before I even typed a single number, I noticed the villain had simply left the heavy steel door wide open!

The correct answer is didn't need to hack.

Because the spy noticed the open door before typing anything, they did not perform the action of hacking. When an action is unnecessary and therefore not performed, we use didn't need to + infinitive.

If the spy had spent three hours hacking the keypad only to realize the door was unlocked the whole time, they would say "I needn't have hacked it."