You are PID_0x7F, a rogue process fighting to survive inside a dying computer. Outrun the system's daemons, solve living data-structure puzzles, and reconstruct the truth your creator tried to delete — before the machine wipes you for good.

<h2 class="bb_tag" >A process that refuses to terminate.</h2>The machine is failing. Sectors are corrupting, memory is being reclaimed, and a wipe order is propagating through the kernel. You are <strong>PID_0x7F</strong> — 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.<h2 class="bb_tag" >Survive the system</h2>The operating system wants you gone. Evade the <strong>gc_daemon</strong> as it sweeps for unreferenced memory, slip past the <strong>watchdog</strong>'s scan cones, outrun the advancing <strong>defrag</strong>, and survive a full <strong>kernel panic</strong>. Unlock abilities to fight back: <strong>Hide</strong> inside free memory, <strong>Fork</strong> a decoy clone to pull pursuers away, and <strong>Signal</strong> to stun the things hunting you.<h2 class="bb_tag" >Solve living data</h2>Every puzzle is a real data structure you manipulate by hand — pop and clear <strong>stacks</strong>, rewire <strong>linked lists</strong> around corruption, repair <strong>binary trees</strong>, file keys into <strong>hash maps</strong>, and cut or sort <strong>graphs</strong>. Difficulty climbs from a gentle tutorial to genuinely tricky deductions.<h2 class="bb_tag" >Reconstruct the truth</h2>Scattered through the machine are the fragments of its former owner — an engineer named <strong>Mara</strong> — and a buried surveillance engine called <strong>Phoenix</strong>. Read corrupted emails, logs, and diaries to piece together what really happened, and why someone wanted it all erased.<h2 class="bb_tag" >Your choices write the ending</h2>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.<br> <br><ul class="bb_ul"><li><strong>A look unlike anything in your library</strong> — cold CRT glow, drifting scanlines, and a tight amber-and-green palette that pulls you inside a machine counting down its own death.<br></li><li><strong>Five families of data-structure puzzles</strong> across 24 sectors and 5 memory regions.<br></li><li><strong>Three abilities</strong> — Hide, Fork, Signal — and four distinct system threats to outwit.<br></li><li><strong>A branching narrative</strong> told through discoverable, corruptible fragments.<br></li><li><strong>Multiple endings</strong> shaped by your choices.</li></ul> <br><strong>Wishlist now</strong> — and play the free demo covering the first three regions.

Good Game Database

RUNLENGTH Achievements