diff --git a/be.js b/be.js
new file mode 100644
index 0000000..ca6010b
--- /dev/null
+++ b/be.js
@@ -0,0 +1,87 @@
+
+/// Manages block types/* and block properties.*/
+// #disposable
+(function(){
+	
+	var propertyTypes = {};
+	function typedef(O){
+		propertyTypes[O.name]=function(options){
+			var o = {},i;for(i in O)o[i]=O[i];
+			o.$prop = document.createElement("div");
+			o.$prop.className = "property "+O.name;
+			o.$ = function(q){
+				return o.$prop.querySelector(q);
+			};
+			o.init(options);
+			return o;
+		};
+	}
+	typedef({
+		name: "number",
+		init: function(options){
+			var html = "<input type='number' value='0'";
+			if(options.min) html += 'min="'+options.min+'"';
+			if(options.max) html += 'max="'+options.max+'"';
+			if(options.step) html += 'step="'+options.step+'"';
+			html += "/>";
+			this.$prop.innerHTML = html;
+			//this.$prop.innerHTML = "<input type='number' min='"+(options.min)+"' max='"+(options.max)+"' step='"+(options.step)+"'/>";
+			this.$input = this.$("input");
+		},
+		getValue: function(){
+			return this.$input.value;
+		},
+		setValue: function(value){
+			this.$input.value = value;
+		}
+	});
+	typedef({
+		name: "text",
+		init: function(options){
+			this.$prop.innerHTML = "<input type='text'/>";
+			this.$input = this.$("input");
+		},
+		getValue: function(){
+			return this.$input.value;
+		},
+		setValue: function(value){
+			this.$input.value = value;
+		}
+	});
+	
+	BlockTypeEditor = function(blocktype, gui){
+		var be=this;
+		be.m = this.m || gui.M();
+		be.m.title("Block Type Editor").position("center left-ish? idk");
+		be.m.onclose=function(){
+			be.m=null;
+			return true;
+		};
+		be.update = function(){
+			if(!be.m)return false;
+			be.m.$c.innerHTML="";
+			/*be.m.$c.style.maxHeight="80vh";
+			be.m.$c.style.minHeight="200px";
+			be.m.$c.style.minWidth="265px";
+			be.m.$c.style.overflowY="auto";
+			be.m.$c.style.overflowX="hidden";*/
+			for(var i in blocktype.properties){
+				//var $prop=document.createElement("div");
+				
+				var p=blocktype.properties[i];
+				if(p.type && propertyTypes[p.type]){
+					var P = propertyTypes[p.type](p);
+					be.m.$c.appendChild(P.$prop);
+				}else{
+					console.error(p.type, "not supported");
+				}
+			}
+		};
+		be.update();
+		be.close = function(){
+			be.m && be.m.close();
+			be.m = null;
+		};
+	};
+	
+})();
\ No newline at end of file
diff --git a/content/art/README.md b/content/art/README.md
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diff --git a/content/art/dawn-gods.png b/content/art/dawn-gods.png
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diff --git a/content/art/mesa.png b/content/art/mesa.png
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index 0000000..0511fdc
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diff --git a/content/art/mesa_1.png b/content/art/mesa_1.png
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index 0000000..c7ed374
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diff --git a/content/art/platformertiles-original-palette.png b/content/art/platformertiles-original-palette.png
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diff --git a/content/art/platformertiles.png b/content/art/platformertiles.png
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diff --git a/content/art/platshrooms.png b/content/art/platshrooms.png
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diff --git a/content/blocks/README.md b/content/blocks/README.md
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diff --git a/list-content.py b/list-content.py
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new mode 100644
diff --git a/pe.js b/pe.js
index c32cef4..b7f82f1 100644
--- a/pe.js
+++ b/pe.js
@@ -162,39 +162,6 @@ PixelEditor = function(gui, img, update, save){
 				pe.ctx.clearRect(0,0,pe.canvas.width,pe.canvas.height);
 				pe.ctx.drawImage(pe.ocanvas,0,0,pe.canvas.width,pe.canvas.height);
 				
-				function fill(x,y, r,g,b,a, wr,wg,wb,wa, life){
-					if(x<0||y<0||x>=id.width||y>=id.height)return;
-					var i=(x%id.width+y*id.width)*4;
-					
-					if(wr===undefined){
-						var wr=id.data[i+0],wg=id.data[i+1],wb=id.data[i+2],wa=id.data[i+3];
-						console.log("fill within color",wr,wg,wb);
-						console.log("fill with color",r,g,b);
-						if(r==wr&&g==wg&&b==wb&&a==wa){
-							console.log("Already that color.");
-							return false;
-						}
-						var life=650;
-						pe.undoable();
-					}
-					
-					if(id.data[i+3]==wa
-					&& id.data[i+0]==wr
-					&& id.data[i+1]==wg
-					&& id.data[i+2]==wb){
-					   id.data[i+0]=r;
-					   id.data[i+1]=g;
-					   id.data[i+2]=b;
-					   id.data[i+3]=a;
-					}else return;
-					
-					if(--life){
-						if(x<id.width)fill(x+1,y, r,g,b,a, wr,wg,wb,wa, life);
-						if(y<id.height)fill(x,y+1, r,g,b,a, wr,wg,wb,wa, life);
-						if(x>0)fill(x-1,y, r,g,b,a, wr,wg,wb,wa, life);
-						if(y>0)fill(x,y-1, r,g,b,a, wr,wg,wb,wa, life);
-					}
-				}
 			}else if(pe.tool==="Replace Color"){
 				var _x=pe.m.mouse.x,_y=pe.m.mouse.y;
 				var id=pe.octx.getImageData(0,0,pe.canvas.width,pe.canvas.height);
@@ -208,32 +175,68 @@ PixelEditor = function(gui, img, update, save){
 				pe.ctx.clearRect(0,0,pe.canvas.width,pe.canvas.height);
 				pe.ctx.drawImage(pe.ocanvas,0,0,pe.canvas.width,pe.canvas.height);
 				
-				function replaceColor(x,y, r,g,b,a){
-					if(x<0||y<0||x>=id.width||y>=id.height)return;
-					var i=(x%id.width+y*id.width)*4;
-					var wr=id.data[i+0],wg=id.data[i+1],wb=id.data[i+2],wa=id.data[i+3];
-					
-					console.log("replace all",[wr,wg,wb,wa],"with",[r,g,b,a]);
-					if(r==wr&&g==wg&&b==wb&&a==wa){
-						console.log("same color");
-						return;
-					}
-					pe.undoable();
-					
-					for(var i=0;i<id.data.length;i+=4){
-						if(id.data[i+3]==wa
-						&& id.data[i+0]==wr
-						&& id.data[i+1]==wg
-						&& id.data[i+2]==wb){
-						   id.data[i+0]=r;
-						   id.data[i+1]=g;
-						   id.data[i+2]=b;
-						   id.data[i+3]=a;
-						}
-					}
+			}
+			
+		}
+		
+		function fill(x,y, r,g,b,a, wr,wg,wb,wa, life){
+			if(x<0||y<0||x>=id.width||y>=id.height)return;
+			var i=(x%id.width+y*id.width)*4;
+			
+			if(wr===undefined){
+				wr=id.data[i+0];
+				wg=id.data[i+1];
+				wb=id.data[i+2];
+				wa=id.data[i+3];
+				console.log("fill within color",wr,wg,wb," with color",r,g,b);
+				if(r==wr&&g==wg&&b==wb&&a==wa){
+					console.log("Already that color.");
+					return false;
 				}
+				life=650;
+				pe.undoable();
+			}
+			
+			if(id.data[i+3]==wa
+			&& id.data[i+0]==wr
+			&& id.data[i+1]==wg
+			&& id.data[i+2]==wb){
+			   id.data[i+0]=r;
+			   id.data[i+1]=g;
+			   id.data[i+2]=b;
+			   id.data[i+3]=a;
+			}else return;
+			
+			if(--life){
+				if(x<id.width)fill(x+1,y, r,g,b,a, wr,wg,wb,wa, life);
+				if(y<id.height)fill(x,y+1, r,g,b,a, wr,wg,wb,wa, life);
+				if(x>0)fill(x-1,y, r,g,b,a, wr,wg,wb,wa, life);
+				if(y>0)fill(x,y-1, r,g,b,a, wr,wg,wb,wa, life);
+			}
+		}
+		function replaceColor(x,y, r,g,b,a){
+			if(x<0||y<0||x>=id.width||y>=id.height)return;
+			var i=(x%id.width+y*id.width)*4;
+			var wr=id.data[i+0],wg=id.data[i+1],wb=id.data[i+2],wa=id.data[i+3];
+			
+			console.log("replace all",[wr,wg,wb,wa],"with",[r,g,b,a]);
+			if(r==wr&&g==wg&&b==wb&&a==wa){
+				console.log("same color");
+				return;
 			}
+			pe.undoable();
 			
+			for(var i=0;i<id.data.length;i+=4){
+				if(id.data[i+3]==wa
+				&& id.data[i+0]==wr
+				&& id.data[i+1]==wg
+				&& id.data[i+2]==wb){
+				   id.data[i+0]=r;
+				   id.data[i+1]=g;
+				   id.data[i+2]=b;
+				   id.data[i+3]=a;
+				}
+			}
 		}
 	};
 	pe.mouseup = function(e){
diff --git a/upload.py b/upload.py
old mode 100755
new mode 100644