SkateBIRD × R.E.P.O.
SkateBIRD × R.E.P.O.
I dropped R.E.P.O. into SkateBIRD: kick golden loot to the extraction zone while grumpy robot gnomes chase the bird. Banked $14k in seconds!
by SIGF
The SIGF app. Mashups on your PC. One click.
Minecraft×Endless Sky
Play game mashupsin one click
Every store. Undo anytime. Play with friends.
macOS 11 or later, Apple Silicon and Intel. The Mac app is not notarized by Apple yet, so the first time you open it macOS blocks it: click Done, open System Settings > Privacy & Security and click Open Anyway. Once only.
SIGF is a desktop app for Windows and macOS. Open this page on your PC to download it.
sigf.ai/app143mashups
64games
1click
Any two games.
One mashup.
Minecraft
×
Endless Sky
=
Minecraft × Endless Sky
Your library is the controller. SIGF finds what you own and shows the mashups you can play right now.
Multiplayer.
Out of the box.
Every multiplayer mashup comes with an invite link. Send it, and your friends are in your game in one click.
- One link to joinPaste it in Discord. A click opens SIGF, installs the exact version you play and connects to your game.
- Public lobbiesOpen your game to anyone who owns the same games, or jump into theirs.
- Free Minecraft serversHost on SIGF: a server for up to 10 players, 8 hours a session, nothing to set up. Your world is kept 7 days, and you can download it.
Fresh mashups.
For your games.
Minecraft × MW2
Minecraft × MW2
I turned Minecraft into Modern Warfare 2: camo soldiers, a Harrier airstrike, and a block-built nuke after ten kills in a row.
by SIGF
TF2 × Attackontitan
TF2 × Attack on Titan
TF2 bots grow into giant Titans and the green-cloaked RED team grapples to their napes. A Titan Heavy stomped me flat.
by SIGF
Skyrim × Celeste
Skyrim × Celeste
I put Celeste in Skyrim: giant strawberries orbit me, Madelines dash-fight Badeline in the snow, and I Fus Ro Dah the berry rain.
by SIGF
Quake × SkateBIRD
Quake × SkateBIRD
I put SkateBIRD into Quake: every grunt is now a shred bird on a skateboard that kickflips at you, and the combo trick text is ridiculous.
by SIGF
GTA V × Diablo + Hellfire
GTA V × Diablo + Hellfire
I turned the Sandy Shores airfield into Diablo: horned demons, loot beams, a holy nova on level-up, and a fat Butcher who dies to one…
by SIGF
Portal 2 × Demonslayer
Portal 2 × Demon Slayer
I turned Portal 2 into Demon Slayer: haori-checkered cubes, demon turrets, and a giant Muzan that burns when the Breathing slashes land.
by SIGF
Skyrim × Dota2
Skyrim × Dota 2
I dropped Dota 2 into Skyrim: green vs red creeps, Pudge hooking draugr, Zeus smiting everyone, and a Roshan fight with Aegis drop.
by SIGF
SkateBIRD × Cyberpunk
SkateBIRD × Cyberpunk
I dropped Night City into SkateBIRD: neon towers, rain, a snarky rock-star bird on the radio and a police drone that fines you for…
by SIGF
Build your own.
Pick two games and watch AI agents build the mashup live. When it's done, it's one click in SIGF.
Made a mashup?
Submit your GitHub repo. We check it, credit you on the card, and it ships in SIGF as a beta.
How it works.
Find your games
SIGF spots what you own on Steam, Epic, GOG, Ubisoft and Minecraft.
One click
Pick a mashup and hit Get: SIGF installs it. Hit Play: it starts the games in the right order.
Restore anytime
Restore vanilla puts back every game file the mashup changed and removes what it added.
FAQ.
Is it safe?
SIGF is open source (AGPL-3.0). Every installer is built by GitHub from the public code (you can scan it on VirusTotal too), and every mashup file is checked against its fingerprint before it touches your game. It never asks for admin rights and never reads your logins. The details.
Why does Windows warn me?
SIGF is new and its code signing (through SignPath Foundation) is still in progress, so SmartScreen may say "Windows protected your PC". Click More info → Run anyway. Want to be sure first? Verify your download. Why Windows warns you.
Is it free?
Yes. The app and every mashup are free. No account, no ads.
Do I need the games?
Yes. Mashups run on games you own. SIGF shows you what you can play with your library.
How do updates work?
SIGF updates itself: it checks for a new version, shows a banner and installs only when you click. Every update is signed, and the app refuses any update that is not. When a mashup gets a new version, its button turns into Update.
Can I play with friends?
Yes. Open a lobby in the app and send its invite link, or make it public for anyone who owns the same games. A click on the link opens SIGF, installs the exact version you play and joins your game. Minecraft mashups run on a free SIGF server: up to 10 players, 8 hours a session, nothing to set up, and the world is kept 7 days so you can download it. In other games, your own game is the server. More on multiplayer.
Mix your library.
macOS 11 or later, Apple Silicon and Intel. The Mac app is not notarized by Apple yet, so the first time you open it macOS blocks it: click Done, open System Settings > Privacy & Security and click Open Anyway. Once only.
Verify your download
- Version
- v0.1.4
- Installer
SIGF-Setup-0.1.4.exe- SHA-256
80d667f8bdc65ececdc03933a406cffa08ef0e831c55377d26b55316bb3bb155- macOS
SIGF-0.1.4-mac.dmg- SHA-256
508015d16f36c083589420d838b92809ba48d60e02ee8a0f644f6a7cc299eccf
Every release is built by GitHub Actions from a tagged commit of SIGFAI/sigf-app, with a SHA256SUMS file and a build attestation. In PowerShell, in the folder of the download:
# 1. The file was built by the public repository's release workflow
gh attestation verify SIGF-Setup-0.1.4.exe --repo SIGFAI/sigf-app
# 2. Its SHA-256 matches the one above and the release's SHA256SUMS
Get-FileHash -Algorithm SHA256 .\SIGF-Setup-0.1.4.exeOn a Mac, in Terminal, in the folder of the download:
gh attestation verify SIGF-0.1.4-mac.dmg --repo SIGFAI/sigf-app
shasum -a 256 SIGF-0.1.4-mac.dmgStep 1 needs the GitHub CLI. It proves where and how the file was built, not that the app is bug-free. Uninstalling SIGF doesn't restore your games: run Restore vanilla on each installed mashup first.