Game · simulator
Core War arena
Programs fight inside an 8000-cell memory. A full ICWS'94 simulator with seven classic warriors, a live view of their code and a tournament.
Things I build
Lab
Games, simulators and tools that run right in your browser, and below them every project I can show: climbing walls that see people, garden automation, radios, pipelines of AI agents, old experiments and new ones. Click a card to play, or to read the story behind it.
9 things to try 44 projects since 2011
Try it in your browser
Teaching · debugger
Redcode debugger
The language of Core War, one animation per instruction, and a debugger that shows every phase of every step, with breakpoints and time travel.
Game
A kysz!
A joke page with a news ticker. Press Space and the headlines turn into enemies: a shooter and an Arkanoid, on the keyboard or a phone.
Comfort game
Lantern River
Click and a paper lantern drifts away on a night river. No score, no timer, no goal. Just watch.
Tool · music
MetroBlocks
A metronome for real songs: blocks with their own tempo and time signature, a clickable timeline and WAV export. In Polish.
Puzzle
Multiples of 0s and 1s
Any number, even your phone number, has a multiple written only with 1s and 0s. Type it in and get the proof.
Teaching
x86 in the browser
Interactive diagrams for my assembly course: segment:offset, registers, flags, the stack, text attributes and VGA mode 13h. In Polish.
Product
Backdoor
Reception software for climbing gyms: RFID at the gate, a real-time desk panel, everything running locally.
Teaching · geography
Tropical climate zone
A 13-chapter interactive lesson on tropical climates: a 3D globe, climate charts and simulations. In Polish.
Performance engineering
GPU and systems work from my day job, told without names: what was slow, what changed, and by how much.
Climbing walls and installations
Cameras, projectors and timers for climbing gyms and interactive spaces.
2026
BoulderTimer: a countdown clock for bouldering
A Raspberry Pi shows a fullscreen countdown on a TV, with beeps and a spoken warning, and you control it from a phone.
2026Watch Your Six: people tracking for LED totems
Several cameras and a pose-detection model turn people walking around an LED installation into OSC events that drive visuals in Resolume.
2025KABE: an interactive climbing wall
An interactive climbing wall: a camera finds the climbers with a pose-detection model, and a projector turns the wall into a game written in Lua.
2019Timeotron 3000: a speed-climbing timer
A start/stop timer for speed climbing with a large LED matrix display.
2019Backdoor: reception software for climbing gyms
Landing page for Backdoor, software that runs the front desk of a climbing gym locally: RFID at the gate and a real-time reception panel.
2016Cinder
A look at the Cinder creative-coding library, which gave the climbing-wall project its name (in Polish).
2016Processing
First steps in Processing for the climbing-wall project: setup(), draw() and the first sketches (in Polish).
2016Cinder Climb
Games on a climbing wall: a Kinect depth camera finds the climbers and a projector draws Lua-scripted activities around them.
2016Wybór technologii
Choosing the technology for Cinder Climb: Processing, Wiring and augmented reality on a wall (in Polish).
2016Cinder climb
The start of Cinder Climb: catching points projected on a climbing wall, against the clock (in Polish).
Games and game design
Playable games, prototypes and concepts.
2026
Bruce Lee: a browser port of a 1984 platformer
My TypeScript port of the 1984 platformer Bruce Lee, with 20 chambers, on a 320x176 canvas. Not playable on this site.
2026Casa de Lgin: a game concept
A concept for a cozy management game in which an AI model reads every order through the character's personality before the character decides what to do.
2026A kysz! A joke page that turns into a game
A joke countdown page with a ticker of Polish news headlines. Press Space and the headlines become targets in a shooter and an Arkanoid.
2026Lantern River: a game with nothing to win
A browser game with nothing to win: click to release paper lanterns onto a night river and watch them drift toward the horizon.
2025River Raid: many attempts at an endless river
Experiments with an endless, generated river for a River Raid-style shooter: how the 1982 original did it, my wave function collapse try, and a path-and-rules generator in Python and Godot.
2024Delta-Void: a game design document
A concept for a top-down action-adventure and survival game in a dark abyss, with a design document, a story, concept art and a small Godot prototype.
2017Peg solitaire solver
A brute-force Python solver for peg solitaire on a triangular board, written to impress my daughter.
Hardware and embedded
Microcontrollers, radios, frame grabbers and machines that pour liquids.
2026
iDotMatrix client and ESP32 bridge
A Python library and ESP32 firmware that drive iDotMatrix LED pixel panels from a computer, also over Wi-Fi.
2024Garden of Eden: ESPHome garden automation
Five ESP32 boards that water the garden, watch the rain barrel and the greenhouse, and report to Home Assistant.
2024lvJanus: a CAEN FERS readout board in LabVIEW
A Windows DLL that lets LabVIEW drive a CAEN FERS-5200 data-acquisition board through CAEN's open-source Janus software.
2021A coin-operated liquid dispenser on a Raspberry Pi
Controller software for a self-service windscreen-fluid dispenser with coins, a card terminal, a flow meter, two pumps and a touchscreen.
2021milInterface: a Matrox frame grabber in LabVIEW
A small C++ DLL that lets LabVIEW grab image sequences from a camera through a Matrox frame grabber.
2019midiHost: a Raspberry Pi MIDI router
A Raspberry Pi with a small screen that lets a MIDI keyboard play a Novation Circuit or a Korg Kaossilator without a computer.
2015Pogodynka: reading a wireless weather station
An Arduino that receives and decodes the 433 MHz radio packets of an Auriol weather-station sensor.
2015avr_flow: a new brain for a liquid vending machine
An ATmega328 controller that replaced the limited PLC of a coin-operated liquid dispenser, with a flow meter, a pump and a 4-digit display.
2012urJTAG – uruchomienie pod ubuntu
Notes on building urJTAG with libftdi on Ubuntu and connecting to a JTAG interface (in Polish).
2011JTAG in the SC2105, which means by stupidity I have more work to do
Taking control of the processor in an SC2105 board over JTAG with OpenOCD, urJTAG and an FT2232-based adapter.
AI, tools and experiments
Agents, pipelines, music tools, video and small experiments.
2026
comments-tool: finding Japanese comments in C/C++
A small Python script that collects the Japanese comments from a C/C++ code base into a JSON file, ready for translation.
2026Dancing with Friends and Enemies: millions of dancers on the GPU
A swarm simulation on WebGPU where every dancer follows one friend and avoids one enemy, up to four million dancers in the browser.
2026AI_Devs 4: course solutions and the Dave agent
My solutions from the AI_Devs 4 course on building LLM applications, and Dave, an agent I wrote to solve the course's capture-the-flag tasks.
2026Siedzieje: finding local events with a pipeline of agents
A pipeline of agents that reads web pages, social media posts, posters and audio and turns them into a structured calendar of local events.
2026MetroBlocks: a block-based metronome
A browser metronome that describes a song as blocks with their own tempo and time signature, played live or exported as a WAV click track.
2025Personas Chat: talk to a local LLM as an uncle or an aunt
A web chat where a local language model answers in Polish in the voice of a persona such as an uncle or an aunt.
2022Pchords
A tool for practising piano chords: it shows a random chord, listens to a MIDI keyboard and checks what you played.
2021Following-of-following monitor
A Python script that takes daily snapshots of whom the accounts I follow are following, and reports what changed.
2018luaBox2D: Box2D physics for Lua
Lua bindings for the Box2D physics engine, so games can be scripted in Lua with real physics.
2017Parents: can children inherit knowledge?
A small genetic-algorithm experiment: what happens to a population when children inherit their parents' knowledge?
2015upmux: an MPEG-TS re-multiplexer
A C tool built on the Upipe framework that takes apart broadcast MPEG transport streams, optionally re-encodes them, and muxes them again with correct clock timing.
2012Messaging experiments: Redis and ZeroMQ
Two small 2012 experiments with message queues: a threaded Redis consumer in C++ and a ZeroMQ request-reply link between C++ and Python.
Teaching
2026
Tropical climate zone: an interactive geography lesson
A 13-chapter interactive geography lesson on tropical climates, with a 3D globe, climate charts and small simulations. In Polish, runs in the browser.
2013C++ concurrency and real-time Linux training
Three-day C++ courses I ran in Kraków in 2013 and 2014 on threads and synchronisation and on real-time programming on Linux.
Work for clients
2026
Work for clients
A short list of the commercial software and firmware I built for companies. Details stay with the clients.
2026A new control panel for a fiber network
I rebuilt an internet provider's GPON operations tool from a blocking Python 2 app into an async FastAPI and Vue 3 system that protects the network hardware.