FAQ

Install BepInEx 5 once, then copy the mod's BepInEx folder into the game folder. The install page has the steps for Windows, Linux (Proton) and Steam Deck.

• SimplePlanes 2 0.7.9. Each mod's page lists the game version it works with.
• BepInEx 5, the 5.4.x x64 build, installed in the game folder. Use BepInEx 5, not the BepInEx 6 pre-releases.
• The Gravy Mod Pack zip, or the zip of a single mod.

The mods run on Windows, and on Linux and Steam Deck through Proton.

It's recommended, not required. The Gravy Mod Menu is where most mods put their in-game settings and status, and Extreme Weather's event buttons are only there. Without it, edit the .cfg files in BepInEx/config/.

Yes. Every mod is its own DLL and no mod needs another one. Download a single mod from its page, or take the whole pack and delete the folders of the ones you don't want from BepInEx/plugins/.

The Classic Islands work the same way: each island and easter egg is its own mod, so keep only the ones you want.

The mods work with SimplePlanes 2 0.7.9. If a game update changes something a mod relies on, that feature switches itself off with a line in BepInEx/LogOutput.log instead of breaking the game, and the rest keeps working.

Every mod is made to be safe to use online. World-changing features are single player or host only, and nothing touches other players' crafts. Each mod's page has a Multiplayer section with the details.

Not all of them yet. Multiplayer is experimental: Walkable Craft and Passenger Seats work well online, and the other mods run in multiplayer but still have bugs there. They work best in single player for now. The table below marks each experimental mod.

• Local only: only you see or hear it. Nothing is sent to other players, they don't need the mod, and it works the same whether you host or join.
• Host only: the main feature only works in single player or when you host. As a guest you get at most its local extras.
• Others need it too: other players need the mod to see the effect.

"Alone" below means single player, or hosting with no other human players connected (AI crafts don't count).

For most mods, no: they're local only. The exceptions:

• Passenger Seats: everyone who wants to ride, or to see riders sitting, needs it. The host doesn't. Players without it see passengers standing in the craft.
• More Players: the host needs it for a bigger server (up to 100 players). Guests only need it to see public lobbies with more than 10 slots in the server browser. Without it they can still join by invite.
• Classic Islands: players without the mods see you flying over open ocean where an island is. Friends with the mods see the same islands if you all keep the default positions.

Some of them add a lot to the world, so they do some work. Most have settings to turn them down. A few examples from the mods' own notes:

• Classic Islands prepares each island's SP2 look a little at a time while it's still far away, and caches it on disk. The game still loads an island's terrain in one frame, so expect one short hitch when an island streams in. A lower LoadDistance saves memory.
• Tree Distance uses about 70 bytes of graphics memory per tree on loaded islands (about 70 MB for a big forested island).
• Birds only draws birds that are in view, and none spawn when the camera is more than 1.5 km above the ground.

The Performance mod is made for low-end PCs. Its Balanced, Low and Potato presets go below the game's own "Low", and they only ever lower your settings. It also switches on fixes for work the game does for nothing. The two options that change how crafts fly are off by default and kept separate from the presets.

Upscaling can also help: it renders at a lower resolution and upscales with FSR 1.

BepInEx/LogOutput.log, inside your SimplePlanes 2 game folder. Include it when you report a problem.

No LogOutput.log after starting the game means BepInEx isn't loading.

• On Linux and Steam Deck, check the launch option: WINEDLLOVERRIDES="winhttp=n,b" %command%.
• On Windows, check that winhttp.dll is next to the game's .exe.
• Make sure it's BepInEx 5 (5.4.x, x64), not BepInEx 6.

If a game update changes something a mod relies on, that feature switches itself off and writes a line about it in BepInEx/LogOutput.log. The rest of the mod keeps working. Check the log, and include it when you report the problem.

Delete its folder from BepInEx/plugins/. The other mods keep working: no mod needs another one.

The pack's sounds (Air Traffic, Sea Traffic, Extreme Weather, Ambient Sounds, Sound Barrier) follow the game's master volume but bypass its mixer, so the game's sound-effect volume doesn't apply to them. Each of those mods has its own volume setting.

No mod needs another one, and several are made to work together. For example, Air Traffic uses runways added by other mods, Airport Lights lights the Classic Islands' airports when those mods are installed, Night Traffic drives Maywar's roads, and Upscaling's page explains how it works with Performance and Graphics Plus.

The mods' notes don't cover other people's BepInEx mods. If something breaks with other mods installed, take them out one at a time to find which one it is.

Yes. The mods are free to download and use. All rights reserved.

No. Gravy Mods is an unofficial fan project. It isn't affiliated with or endorsed by Jundroo. SimplePlanes and SimplePlanes 2 are made by Jundroo, LLC.

No. The mods don't include any of the game's files.

The sounds in Air Traffic, Sea Traffic, Extreme Weather, Ambient Sounds and Sound Barrier are from Pixabay, used under the Pixabay Content License. Most were trimmed, loudness-matched, looped and converted to OGG Vorbis for the game. Pixabay doesn't require attribution; they're credited here anyway.

No. The mods are released as compiled DLLs in zip files.

BepInEx (LGPL-2.1) and Harmony (MIT) are used to build the mods but aren't included: you install BepInEx yourself. Air Traffic's airliner was made by the Gravy Mods authors.