A process that refuses to terminate.

The machine is failing. Sectors are corrupting, memory is being reclaimed, and a wipe order is propagating through the kernel. You are PID_0x7F — a process that was never meant to keep running. Everything unfolds inside the machine itself: cold CRT glow, drifting scanlines, and the amber light of a cursor that shouldn't still be blinking.

Survive the system

The operating system wants you gone. Evade the gc_daemon as it sweeps for unreferenced memory, slip past the watchdog's scan cones, outrun the advancing defrag, and survive a full kernel panic. Unlock abilities to fight back: Hide inside free memory, Fork a decoy clone to pull pursuers away, and Signal to stun the things hunting you.

Solve living data

Every puzzle is a real data structure you manipulate by hand — pop and clear stacks, rewire linked lists around corruption, repair binary trees, file keys into hash maps, and cut or sort graphs. Difficulty climbs from a gentle tutorial to genuinely tricky deductions.

Reconstruct the truth

Scattered through the machine are the fragments of its former owner — an engineer named Mara — and a buried surveillance engine called Phoenix. Read corrupted emails, logs, and diaries to piece together what really happened, and why someone wanted it all erased.

Your choices write the ending

What you preserve, what you destroy, and who you help decide how RUNLENGTH ends. Multiple endings. No clean villains. Just a process deciding what's worth carrying out of a dying machine.

• A look unlike anything in your library — cold CRT glow, drifting scanlines, and a tight amber-and-green palette that pulls you inside a machine counting down its own death.
  
• Five families of data-structure puzzles across 24 sectors and 5 memory regions.
  
• Three abilities — Hide, Fork, Signal — and four distinct system threats to outwit.
  
• A branching narrative told through discoverable, corruptible fragments.
  
• Multiple endings shaped by your choices.

Wishlist now — and play the free demo covering the first three regions.