A character that slides backward instead of turning around kills immersion instantly. In GDevelop, fixing this takes two events in the Event Sheet and about three minutes. But there's one beginner mistake that makes the sprite flicker or refuse to flip at all — and almost everyone hits it the first time.
Setup Assumptions
You already have:
A character sprite imported into your scene
A platform/ground sprite in your scene
Both scaled to a size where you can clearly see which direction the character faces
If your character is tiny on screen, scale it up in the editor before testing. You need to see the flip to debug the flip.
Assign Platformer Behaviors
GDevelop handles physics through its Behavior system. Two behaviors make a basic platformer work:
For the character:
Double-click the sprite → Behaviors tab → Add a Behavior → Platform Character. Keep the defaults and apply.
For the ground/platforms:
Double-click the platform sprite → Behaviors tab → Add a Behavior → Platform. Apply.
Run a preview. Your character should move with arrow keys and jump. But you'll notice the problem — the sprite faces the same direction no matter which way you move. That's what we're fixing.
The Flip Logic: Two Separate Events
Open your Event Sheet. You need exactly two events.
Event 1 — Moving Right (reset to default orientation):
Condition: Key Pressed → Right
Action: Flip the object horizontally → select your character → Activate flipping: No
Event 2 — Moving Left (mirror the sprite):
Condition: Key Pressed → Left
Action: Flip the object horizontally → select your character → Activate flipping: Yes
That's it. The flip action mirrors the entire sprite so you don't need separate left-facing and right-facing animation frames.
The Mistake Everyone Makes
Putting both actions in the same event block. If you group the right-key flip and left-key flip under one event or nest them together without proper separation, the engine processes both instructions on the same frame and the sprite either flickers or doesn't flip at all.
GDevelop executes events top to bottom every frame. Conflicting flip instructions in the same block means the last one always wins, or worse, they fight each other. Two separate top-level events eliminates the conflict entirely. The engine checks each condition independently and only fires the matching action.
This is the single most common reason beginners can't get sprite flipping to work. If your flip looks broken, check your Event Sheet structure before anything else.
Quick Reference
Platform Character behavior on the player, Platform behavior on the ground
Flip Horizontally is a toggle: Yes = mirrored, No = default
Right key → flip No, Left key → flip Yes
Separate events, not one combined event
Preview often — the flip should feel instant at any movement speed
From Here
Once your character faces the right direction, you've got the foundation for everything else — run animations, attack directions, wall interactions, and enemy AI that reacts to which way the player is facing. It's a small detail that touches every system you'll build on top of it.
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