LogicForge

LogicForge is a logic-building and programming game in which you create circuits from just two gates: NOT and AND. You combine them into OR, XOR, multiplexers, adders, registers, an ALU and, eventually, your own 8-bit CPU with an assembler.

Build circuits

You can turn any circuit into a reusable component in your library with one key. Components can be nested to any depth, and the live view lets you open an instance and inspect its internal structure and real values. Truth tables, a waveform view with cursors and halt conditions help you examine how circuits behave.

The game also supports a keyboard, terminal, screen, RAM and ROM. You can export and import Verilog, export finished circuits to Arduino, and import Logisim files.

Story mode

Story mode has over 100 chapters across several worlds, each with a character who develops as you progress. Each chapter gives you a goal, but leaves the solution to you; stars reward correctness and economy. Solved blocks, including OR, XOR, adders, ALUs, flip-flops, registers and counters, become available in your library.

Circuits and programming

The game covers several ways to build and program systems:

• Circuits: build from a first NAND gate to your own CPU using only NOT and AND gates.
• Industry: work with Hubert the forklift to build real-world-style controllers using latches, counters, timers and step sequences for a house and garden, city traffic and a factory.
• Assembly: program the LF-8, the CPU you built, using loops and subroutines. Projects include sorting, a traffic light and an elevator.
• Python: learn programming from the beginning, with one new idea per chapter, a short lesson and an example you can run. Feedback identifies differences between your output and the expected output. Later, your scripts can become components and control animated scenes.

Share in the Workshop

You can share components, simulations and tasks with others through the Steam Workshop or a plain folder.