Breaking and entering title text

I’ve heard that at some room escapes you have to solve a lock. That’s cute. Let’s see how you do at solving a key.

Not just any key: I’ve broken it into 8 pieces. When assembled correctly, it looks like this:

Countdown Key

To assemble the key, use the Google Slide that I’ve created for you. (You’re welcome.) You will need to use all 7 of the red pieces and just 1 of the 5 blue pieces.

Which blue piece is required to replicate this image? 

The answer will unlock a clue to my true identity.

A game master will provide you with what you need to solve this puzzle.