Like nandgame? Build a computer from transistors up
nandgame is a great free browser game that has you build a working computer as a series of puzzles, starting from a single NAND gate and composing your way up to an ALU, memory, a CPU and an assembler. If that is what brought you here, digiwleea is a free, in-browser alternative with a different angle: you build a computer from the transistor up.
What nandgame is good at
nandgame's puzzle progression is tight and genuinely satisfying, and if its "build the whole machine from NAND" hook grabbed you, you are exactly who digiwleea is built for. (digiwleea is an independent project, not affiliated with nandgame.)
How digiwleea is different
The big difference is what you are working in. nandgame is a fixed sequence of wiring puzzles; digiwleea is a real switch-level circuit simulator and open lab. You place NMOS and PMOS transistors and wires on a free canvas, watch the nets settle live, and get instant truth-table verification, so you can build the intended circuit and then keep experimenting. It also goes one level deeper (you build NAND itself from CMOS transistors first), pairs the building with real theory lessons, and adds an AI tutor (Wleea) that can explain a fault or build a circuit alongside you.
| nandgame | digiwleea | |
|---|---|---|
| Format | Fixed puzzle sequence | Open lab + guided 30+ level course |
| Smallest building block | The NAND gate | CMOS transistors (build NAND too) |
| Real circuit simulator | Puzzle wiring | Yes, switch-level, live signals |
| Theory lessons | In-puzzle hints | A full linked theory library |
| AI tutor | No | Yes (Wleea) |
| Price / install | Free, in-browser | Free, in-browser, no sign-up to start |
No sign-up is needed to start: open the lab and place your first transistor, or read the free theory course. The account (and the AI tutor) are optional.
See for yourself: build a logic gate from transistors in the simulator, then follow the path from sand to an 8-bit CPU.
Open the digiwleea lab →Frequently asked
Is digiwleea a good nandgame alternative?
Yes, if you want to understand digital logic from the ground up. digiwleea is a free, in-browser simulator and 30+ level course where you build every gate from CMOS transistors and work up to a real 8-bit CPU, with an AI tutor to help.
Is digiwleea free?
The sandbox lab and the first act of the course are free and need no sign-up. An optional account adds the AI tutor and cross-device sync; the full course and tutor are a one-time unlock plus an optional subscription.
Do I need to install anything?
No. digiwleea runs entirely in your browser, on desktop or mobile, and works offline once loaded.