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diff --git a/src/BlockPhysics.h b/src/BlockPhysics.h
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+++ b/src/BlockPhysics.h
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+#ifndef CC_BLOCKPHYSICS_H
+#define CC_BLOCKPHYSICS_H
+#include "Core.h"
+/* Implements simple block physics.
+   Copyright 2014-2023 ClassiCube | Licensed under BSD-3
+*/
+typedef void (*PhysicsHandler)(int index, BlockID block);
+
+CC_VAR extern struct Physics_ {
+	/* Whether block physics are enabled at all. */
+	cc_bool Enabled;
+	/* Called when block is activated by a neighbouring block change. */
+	/* e.g. trigger sand falling, water flooding */
+	PhysicsHandler OnActivate[256];
+	/* Called when this block is randomly activated. */
+	/* e.g. grass eventually fading to dirt in darkness */
+	PhysicsHandler OnRandomTick[256];
+	/* Called when user manually places a block. */
+	PhysicsHandler OnPlace[256];
+	/* Called when user manually deletes a block. */
+	PhysicsHandler OnDelete[256];
+} Physics;
+
+void Physics_SetEnabled(cc_bool enabled);
+void Physics_OnBlockChanged(int x, int y, int z, BlockID old, BlockID now);
+void Physics_Init(void);
+void Physics_Free(void);
+void Physics_Tick(void);
+#endif