diff --git a/game/grid.go b/game/grid.go
index d59e7ea..d951d2a 100644
--- a/game/grid.go
+++ b/game/grid.go
@@ -31,6 +31,19 @@ func (g *Grid) Set(x, y byte, c Block) {
 	(*g)[uint16(x)+(uint16(y)*GRID_WIDTH)] = c
 }
 
+func (g *Grid) ClearFullRows() byte {
+	completed := byte(0)
+	for y := int(g.Height() - 1); y >= 0; y-- {
+		if g.IsRowFull(byte(y)) {
+			completed++
+			g.ClearRow(byte(y))
+		} else if completed > 0 {
+			g.MoveRowDown(byte(y), completed)
+		}
+	}
+	return completed
+}
+
 func (g *Grid) IsRowFull(y byte) bool {
 	for x := range byte(g.Width()) {
 		if g.At(x, y) == BLOCK_EMPTY {