Tower of Hanoi

PoliCTF 2017 - PowderToy CPU

by on under PoliCTF2017
1 minute read ·

Why reverse a program when you can reverse a computer & CPU with custom ISA?

Program CPU description


This CPU is a save file of Powder Toy;
From the website: “The Powder Toy is a free physics sandbox game… The game provides you with various building materials, liquids, gases and electronic components

I have, in a moment of madness ;), decided to build a cpu, painting it by hand pixel after pixel…

Making a cpu is something that was on my “todo list” from some time and this was the perfect opportunity!

Here you can find a document describing the parts, how do they work, the program that it execute, and the flag.

Download pdf writeup
Download Challenge
Download Solved challenge

Thanks anyone for playing!
Greetings from Italy

reversing, powder toy, cpu, computer, isa
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