OpenDiablo2/et

diff --git a/d2common/d2fileformats/d2ds1/ds1_test.go b/d2common/d2fileformats/d2ds1/ds1_test.go
index 23035a50..d17527f0 100644
--- a/d2common/d2fileformats/d2ds1/ds1_test.go
+++ b/d2common/d2fileformats/d2ds1/ds1_test.go
@@ -575,6 +575,24 @@ func TestDS1_SetNumberOfFloors(t *testing.T) {
 	if err := testIfRestorable(ds1, test); err != nil {
 		t.Errorf("unable to restore: %v", err)
 	}
+
+	newNumber = 10
+
+	ds1.SetNumberOfFloorLayers(newNumber)
+
+	test = func(ds1 *DS1) {
+		if len(ds1.tiles[0][0].Floors) != int(newNumber) {
+			t.Fatal("unexpected floors length set")
+		}
+
+		if ds1.numberOfFloorLayers != newNumber {
+			t.Fatal("unexpected floors length set")
+		}
+	}
+
+	if err := testIfRestorable(ds1, test); err != nil {
+		t.Errorf("unable to restore: %v", err)
+	}
 }
 
 func TestDS1_NumberOfShadowLayers(t *testing.T) {
diff --git a/d2common/d2fileformats/d2ds1/layers.go b/d2common/d2fileformats/d2ds1/layers.go
index f69ef7f1..b0488a34 100644
--- a/d2common/d2fileformats/d2ds1/layers.go
+++ b/d2common/d2fileformats/d2ds1/layers.go
@@ -1 +1,39 @@
 package d2ds1
+
+const (
+	maxWalls = 4
+)
+
+type WallLayer [][]*Wall
+type FloorLayer [][]*Floor
+type ShadowLayer [][]*Shadow
+
+type layers struct {
+	Walls []WallLayer
+	Floors []FloorLayer
+	Shadows []ShadowLayer
+}
+
+func (l *layers) PushWallLayer() {
+
+}
+
+func (l *layers) PopWallLayer() WallLayer {
+
+}
+
+func (l *layers) PushFloorLayer() {
+
+}
+
+func (l *layers) PopFloorLayer() FloorLayer {
+
+}
+
+func (l *layers) PushShadowLayer() {
+
+}
+
+func (l *layers) PopShadowLayer() ShadowLayer {
+
+}