diff --git a/project.md b/project.md
index 25d0466..a779f05 100644
--- a/project.md
+++ b/project.md
@@ -4,6 +4,9 @@ Todo
 	- [ ] save/load preferences
 	- [ ] load custom image
 	- [ ] flip panel for more options
+- [o] piece
+	- [X] rounded corners
+	- [ ] thickness
 - [ ] highlight hints
 - [ ] art generator
 - [ ] properly align widgets
@@ -33,3 +36,4 @@ Inspiration
 -----------
 - [ZHED](playzhed.com)
 - [adrena...line](managore.itch.io/adrena-line)
+- [pet putt](http://petputt.com/)
diff --git a/src/Main.tscn b/src/Main.tscn
index b1a90bd..1b876fd 100644
--- a/src/Main.tscn
+++ b/src/Main.tscn
@@ -39,6 +39,9 @@ margin_right = 540.0
 margin_bottom = 560.0
 rows = 4
 columns = 4
+width = 512
+height = 512
+current_state = 0
 
 [node name="VSplitContainer" type="VBoxContainer" parent="HSplitContainer"]
 margin_left = 548.0
diff --git a/src/Piece.tscn b/src/Piece.tscn
index d69571c..96df301 100644
--- a/src/Piece.tscn
+++ b/src/Piece.tscn
@@ -1,4 +1,4 @@
-[gd_scene load_steps=13 format=2]
+[gd_scene load_steps=14 format=2]
 
 [ext_resource path="res://src/Piece.gd" type="Script" id=1]
 [ext_resource path="res://assets/escher_lizards.jpg" type="Texture" id=2]
@@ -6,6 +6,16 @@
 [sub_resource type="VisualShaderNodeVec3Constant" id=1]
 constant = Vector3( 0.3, 0.3, 0 )
 
+[sub_resource type="VisualShaderNodeExpression" id=12]
+output_port_for_preview = 0
+size = Vector2( 620, 395 )
+expression = "// https://iquilezles.org/www/articles/distfunctions2d/distfunctions2d.htm
+vec2 rel_p = input.xy - vec2(0.5, 0.5);
+float box = 0.4;
+vec2 d = abs(rel_p) - vec2(box, box); // mirroring
+float dist = length(max(d, 0.0)) + min(max(d.x,d.y), 0.0);
+alpha_mask = dist < (0.5 - box);"
+
 [sub_resource type="VisualShaderNodeTexture" id=2]
 output_port_for_preview = 0
 texture = ExtResource( 2 )
@@ -38,6 +48,7 @@ uniform vec3 offset;
 uniform sampler2D tex_frg_3;
 
 
+
 void vertex() {
 // Output:0
 
@@ -45,34 +56,40 @@ void vertex() {
 
 void fragment() {
 // Input:4
-	vec3 n_out4p0;
-	n_out4p0 = vec3(UV,0.0);
+	vec3 n_out4p0 = vec3(UV, 0.0);
 
 // VectorUniform:7
-	vec3 n_out7p0;
-	n_out7p0 = scale;
+	vec3 n_out7p0 = scale;
 
 // VectorOp:5
-	vec3 n_out5p0;
-	n_out5p0 = n_out4p0 * n_out7p0;
+	vec3 n_out5p0 = n_out4p0 * n_out7p0;
 
 // VectorUniform:8
-	vec3 n_out8p0;
-	n_out8p0 = offset;
+	vec3 n_out8p0 = offset;
 
 // VectorOp:6
-	vec3 n_out6p0;
-	n_out6p0 = n_out5p0 + n_out8p0;
+	vec3 n_out6p0 = n_out5p0 + n_out8p0;
 
 // Texture:3
-	vec3 n_out3p0;
-	float n_out3p1;
-	vec4 tex_frg_3_read = texture( tex_frg_3 , n_out6p0.xy );
-	n_out3p0 = tex_frg_3_read.rgb;
-	n_out3p1 = tex_frg_3_read.a;
+	vec4 tex_frg_3_read = texture(tex_frg_3, n_out6p0.xy);
+	vec3 n_out3p0 = tex_frg_3_read.rgb;
+	float n_out3p1 = tex_frg_3_read.a;
+
+// Expression:13
+	bool n_out13p0;
+	n_out13p0 = false;
+	{
+		// https://iquilezles.org/www/articles/distfunctions2d/distfunctions2d.htm
+		vec2 rel_p = n_out4p0.xy - vec2(0.5, 0.5);
+		float box = 0.4;
+		vec2 d = abs(rel_p) - vec2(box, box); // mirroring
+		float dist = length(max(d, 0.0)) + min(max(d.x,d.y), 0.0);
+		n_out13p0 = dist < (0.5 - box);
+	}
 
 // Output:0
 	COLOR.rgb = n_out3p0;
+	COLOR.a = n_out13p0 ? 1.0 : 0.0;
 
 }
 
@@ -81,27 +98,38 @@ void light() {
 
 }
 "
-graph_offset = Vector2( 0, 75 )
+graph_offset = Vector2( -213.196, 77.3248 )
 mode = 1
 flags/light_only = false
-nodes/fragment/0/position = Vector2( 1080, 160 )
+nodes/fragment/0/position = Vector2( 1120, 360 )
 nodes/fragment/3/node = SubResource( 2 )
 nodes/fragment/3/position = Vector2( 820, 120 )
 nodes/fragment/4/node = SubResource( 3 )
-nodes/fragment/4/position = Vector2( 40, 60 )
+nodes/fragment/4/position = Vector2( -120, 360 )
 nodes/fragment/5/node = SubResource( 4 )
 nodes/fragment/5/position = Vector2( 360, 80 )
 nodes/fragment/6/node = SubResource( 5 )
 nodes/fragment/6/position = Vector2( 620, 240 )
 nodes/fragment/7/node = SubResource( 6 )
-nodes/fragment/7/position = Vector2( 40, 240 )
+nodes/fragment/7/position = Vector2( 80, 60 )
 nodes/fragment/8/node = SubResource( 7 )
-nodes/fragment/8/position = Vector2( 360, 380 )
+nodes/fragment/8/position = Vector2( 380, 340 )
 nodes/fragment/9/node = SubResource( 8 )
-nodes/fragment/9/position = Vector2( 40, 300 )
+nodes/fragment/9/position = Vector2( -80, 120 )
 nodes/fragment/11/node = SubResource( 1 )
-nodes/fragment/11/position = Vector2( 360, 440 )
-nodes/fragment/connections = PoolIntArray( 3, 0, 0, 0, 4, 0, 5, 0, 5, 0, 6, 0, 6, 0, 3, 0, 7, 0, 5, 1, 8, 0, 6, 1 )
+nodes/fragment/11/position = Vector2( 220, 400 )
+nodes/fragment/13/node = SubResource( 12 )
+nodes/fragment/13/position = Vector2( 260, 540 )
+nodes/fragment/13/size = Vector2( 620, 395 )
+nodes/fragment/13/input_ports = "0,1,input;"
+nodes/fragment/13/output_ports = "0,2,alpha_mask;"
+nodes/fragment/13/expression = "// https://iquilezles.org/www/articles/distfunctions2d/distfunctions2d.htm
+vec2 rel_p = input.xy - vec2(0.5, 0.5);
+float box = 0.4;
+vec2 d = abs(rel_p) - vec2(box, box); // mirroring
+float dist = length(max(d, 0.0)) + min(max(d.x,d.y), 0.0);
+alpha_mask = dist < (0.5 - box);"
+nodes/fragment/connections = PoolIntArray( 3, 0, 0, 0, 5, 0, 6, 0, 6, 0, 3, 0, 13, 0, 0, 1, 4, 0, 5, 0, 4, 0, 13, 0, 8, 0, 6, 1, 7, 0, 5, 1 )
 
 [sub_resource type="ShaderMaterial" id=10]
 shader = SubResource( 9 )
@@ -123,6 +151,7 @@ __meta__ = {
 }
 
 [node name="Label" type="Label" parent="ColorRect"]
+visible = false
 margin_left = 10.0
 margin_top = 10.0
 margin_right = 50.0