diff --git a/day18/day.go b/day18/day.go
index 7e5434a..baba46f 100644
--- a/day18/day.go
+++ b/day18/day.go
@@ -4,9 +4,9 @@ import (
 	"tools"
 )
 
-func play(grid tools.ToggleGrid, stuckCorners bool) {
-	neighbours := tools.NewIntGrid()
-	for thisCoord := range grid.GetCoordinates() {
+func play(grid tools.GridToggle, stuckCorners bool) {
+	neighbours := tools.NewGridInt()
+	for _, thisCoord := range grid.GetCoordinates() {
 		for cx := thisCoord.X - 1; cx <= thisCoord.X+1; cx++ {
 			for cy := thisCoord.Y - 1; cy <= thisCoord.Y+1; cy++ {
 				if cy == thisCoord.Y && cx == thisCoord.X {
@@ -32,8 +32,8 @@ func play(grid tools.ToggleGrid, stuckCorners bool) {
 	}
 }
 
-func makeGridFromInput(input []string) tools.ToggleGrid {
-	grid := tools.NewToogleGrid()
+func makeGridFromInput(input []string) tools.GridToggle {
+	grid := tools.NewGridToggle()
 	for y, line := range input {
 		for x, c := range line {
 			if c == '#' {