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Engineers! Here's my design for the new Colossus.

I've ripped it into 5 parts to make it easier.

Use each sketch to build a part of the machine, then we'll get Colossus working.

You'll need to hurry - many lives depend upon it.

Good luck!

Tommy Flowers

You built Colossus in 3 minutes 2 seconds

You've cracked it!

You've built Colossus.

Because of you, enemy messages can now be decoded much faster and will bring a faster end to the war.

Well done!

Tommy Flowers