diff --git a/world.go b/world.go
index 5af135a..4b64b50 100644
--- a/world.go
+++ b/world.go
@@ -45,6 +45,7 @@ type World interface {
 	SetSpeed(speed float64) error
 	AddSystem(sys ...ISystem)
 	Close()
+	Tick() int
 }
 
 type world struct {
@@ -73,6 +74,9 @@ func NewWorld(tick int) World {
 	}
 }
 
+func (w *world) Tick() int {
+	return w.tick
+}
 func (w *world) Id() WorldId {
 	return WorldId(w.world.Id())
 }