its a fun classic, but i STRONGLY recommend downloading OpenRCT2 or buying RollerCoaster Tycoon Classic instead
changed executable, ran the game in window mode
i made the config
fullscreen displays the original 4:3 resolutions on the top left side of the screen, window mode fills up the screen with a 4:3 aspect ratio, made a fix to stretch window and fill the whole screen
the version of proton steam uses by default has some sort of issue and does not allow you to save games, GE-Proton7-38 does allow you to save games properly
if you for some reason want to play the vanilla version, set the game to window mode, you will get a 4:3 resolution but atleast the game will fill up the screen vertically, if you want a widescreen option, you can try downloading this mod
https://www.moddb.com/games/rollercoaster-tycoon/downloads/rctdeluxe-fix-for-steamdeck
tough honestly, you are probably better off downloading OpenRCT2 and running this game through that or buying RollerCoaster Tycoon Classic, but if for some reason you only have RCTD, dont want to buy Classic and dont want to download OpenRCT2, then just download the fix
If the save/load functionality doesn't work then it can't really be played on your map on multiple occasions
Even if not full screen after a change in the game, it was on the left side rather then centered
No sure if couldn't load or save

If you don't care about your battery life, this game works well. Specify a virtual resolution before playing to fix fullscreen.
Text is harder to read at higher resolutions as the game does not upscale.
You must specify a virtual resolution in the game's properties in Steam, then set the game's internal resolution to match the virtual display.
Huge power draw on Steam Deck.
I do not recommend this title on Steam Deck at this moment due to battery drain. Please note that I did not try this with OpenRCT2, which may or may not change battery impact.
Fully playable on Steam Deck. Minor resolution issue must be adjusted using game options once. Set Left Joystick to arrow keys for movement.
- Left Joystick = Direction Pad with arrow keys. Used to move the in-game viewpoint.
- Right Joystick = Joystick Mouse, with mouse sensitivity set to 25. Used for fine adjustments of the mouse, or casual play without the trackpad.
- All other controls are accessible via the in-game menu, and hotkeys can be assigned according to individual preference. Hot key commands are visible through the in-game "Options" menu.
Upon first booting the game, it will be displayed in a small window in the upper-left of the Steam Deck, not filling the height of the screen. Using the trackpad mouse controls:
- Start any game mode.
- Select the floppy disc icon from the on-screen menu.
- Select "Options"
- Change the "Display Mode" to "Window"
The screen will now fill the Steam Deck resolution and no further adjustments will be necessary.
Game is perfectly playable. Either run the game in Desktop Mode, or set the game in Windowed and scale it during Gaming Mode.
Once in-game, click on the Floppy Diskette icon to go to the settings and change the screen resolution from Fullscreen to Windowed, and let Steam scale it using Linear, Nearest, Integer or FSR (personal recommendation: FSR). This will center the game screen for proper use.
Quick Access Menu battery performance settings:
- Refresh Rate set to 40: in-game FPS is 38 so reducing the screen refresh rate is beneficial.
- Thermal Power (TDP) Limit enabled, set to 3 Watts: game does not use much power on its own.
- Manual GPU Clock Control enabled, set to GPU Clock Frequency 200: game does not use much power on its own.
Fullscreen issues:
- Games start with
Full Screen 640x480
option, causing the game to be too small and appearing in the left top corner.- To fix this, go to the tutorial (third option on the title screen, clicking on the trackpad required once you load in to get control over the cursor) or try a new Scenario. Then click on the Floppy Diskette icon, then on the Options button. Change the Display Mode from
Full Screen 640x480
toWindowed
for a centered game screen. Filtering (Linear, Nearest, Integer, FSR) can be adjusted in the Quick Access Menu.
- To fix this, go to the tutorial (third option on the title screen, clicking on the trackpad required once you load in to get control over the cursor) or try a new Scenario. Then click on the Floppy Diskette icon, then on the Options button. Change the Display Mode from
- When starting the tutorial (from the title screen, third option), the game reverts back to the
Full Screen 640x480
option.- To fix this, repeat the above step to change the Display Mode back to
Windowed
.
- To fix this, repeat the above step to change the Display Mode back to
Personal recommendation in Scaling Filter choice: FSR seems the prettiest over Linear (blurry), Nearest (uneven pixels all over) and Integer (too small).
Doesn't support 800p natively, only 768p at max. Lower resolutions don't scale to the screen of the Steam Deck, unless you are in windowed mode.
Game runs natively at 38 fps. This game is fully playable on Steam Deck, but would recommend OpenRCT2.