Reverse Engineering SimTower

Childhood tower game gets a wild fan remake, and the comments are losing it

TLDR: A developer used artificial intelligence to help recreate the classic game *SimTower* as an online co-op remake, and fans instantly piled in with nostalgia, sequel requests, and bug-lawyer energy. The biggest mood in the comments: excitement mixed with jokes about missing old tricks and the eye-popping cost of making it happen.

A beloved old building game about cramming people into elevators has been dragged gloriously into 2026, and the crowd is very online about it. The developer behind towers.world tried an almost absurd challenge: use modern artificial intelligence tools to help figure out how the original SimTower worked, then rebuild it as a shiny new online version where people can play together. The result is live, playable, and catnip for nostalgic gamers who have spent years wrestling with emulators just to relive their childhood elevator disasters.

But the real fireworks are in the reactions. One camp is pure heart-eyes: “super cool,” “soft spot,” and immediate demands for the forgotten sequel Yoot Tower to get the same treatment. Another camp zoomed straight past the technical feat to nitpick the true scandal: where is the famous exploit that supposedly doubles your starting money if you place the first lobby tile in the bottom-left corner? For some fans, this isn’t a remake debate — it’s a lore emergency.

Then came the wonderfully nerdy chaos. One commenter shared that trying to replay the original in compatibility software crashes their whole desktop, making this remake feel less like a fun project and more like a public service. Meanwhile, another zeroed in on the most memeable detail of all: the creator had to upgrade to a $200 a month AI plan and dodge the dreaded “8 AM to 2 PM peak pricing” window. So yes, the internet’s verdict is in: this is equal parts inspiring tribute, nostalgia bomb, and hilariously expensive rabbit hole.

Key Points

  • The author launched towers.world, a modern collaborative clone of SimTower.
  • The project aimed to reverse engineer the original game binary into a clean-room specification using LLMs.
  • The author used a custom framework called reaper to connect an AI coding agent to Ghidra for static analysis.
  • Static analysis produced partial understanding of the game but did not reach a playable simulation or behavioral parity with the original.
  • The article identifies three AI limitations in this task: premature conclusions, incomplete documentation of analysis details, and poor separation of conceptual design from implementation-specific binary details.

Hottest takes

"It is missing the most important function" — dsl
"If the first tile you build is a lobby in the bottom left corner, it is supposed to double your starting money" — dsl
"that doesnt sound too terrible to be honest. TIL that 8am-2pm is 2x usage" — swyx
Made with <3 by @siedrix and @shesho from CDMX. Powered by Forge&Hive.