diff --git a/slimes/init.lua b/slimes/init.lua
index 9622868..acc4c48 100644
--- a/slimes/init.lua
+++ b/slimes/init.lua
@@ -1,13 +1,18 @@
+SLIME_SIZE = 0.5
+SLIME_BOX = math.sqrt(2*math.pow(SLIME_SIZE, 2))/2
+
 minetest.register_entity("slimes:small",{
 	initial_properties = {
 		hp_max = 4,
-		visual_size = {x = 0.5, y = 0.5, z = 0.5},
+		visual_size = {x = SLIME_SIZE, y = SLIME_SIZE, z = SLIME_SIZE},
 		visual = "cube",
 		textures = {"default_cactus_top.png"},
-		selection_box = {-0.25, -0.25, -0.25, 0.25, 0.25, 0.25},
+		collisionbox = {-SLIME_BOX, -0.25, -SLIME_BOX, SLIME_BOX, 0.25, SLIME_BOX},
+		physical = true,
 	},
 
 	timer = 0,
+	timer2 = 0,
 	yaw = 0,
 	direction = {},
 	ground_touched = false,
@@ -15,6 +20,7 @@ minetest.register_entity("slimes:small",{
 	on_activate = function(self)
 		self.yaw = math.random() * 360
 		self.direction = {x = math.cos(self.yaw), y = 5, z = math.sin(self.yaw)}
+		self.object:setacceleration({x = 0, y = -9.8, z = 0})
 	end,
 
 	on_punch = function(self)
@@ -24,42 +30,29 @@ minetest.register_entity("slimes:small",{
 	on_step = function(self, dtime)
 		local pos = self.object:getpos()
 		self.timer = self.timer + dtime
+		self.timer2 = self.timer2 + dtime
 
 		if self.timer > 4 then
 			if slime_lonely(pos) and not minetest.env:find_node_near(pos, 32, "default:mese") then
 				self.object:remove()
 			end
-			if not ground_touched then
-				self.object:setacceleration({x = 0, y = -1, z = 0})
-			end
 			ground_touched = false
 			self.timer = 0
 			self.yaw = math.random() * 360
 			self.direction = {x = math.cos(self.yaw), y = 5, z = math.sin(self.yaw)}
 		end
 
-		if slime_collides(pos, self.direction, self.initial_properties.visual_size.x) then
-			self.direction = {x = 0, y = 4, z = 0}
-		end
-
-		local nu = minetest.env:get_node({x = pos.x, y = pos.y - self.initial_properties.visual_size.y/1.99, z = pos.z})
-		if nu.name ~= "air" then
-			ground_touched = true
-			self.object:setyaw(self.yaw)
-			self.object:setvelocity(self.direction)
-			self.object:setacceleration({x = 0, y = -9.8, z = 0})
+		if self.timer2 > 1 then
+			local nu = minetest.env:get_node({x = pos.x, y = pos.y - self.initial_properties.visual_size.y/1.99, z = pos.z})
+			if nu.name ~= "air" then
+				self.object:setyaw(self.yaw)
+				self.object:setvelocity(self.direction)
+				self.timer2 = 0
+			end
 		end
 	end,
 })
 
-function slime_collides(pos, direction, size)
-	local np = {	x = pos.x + direction.x * size * 2,
-			y = pos.y + 1,
-			z = pos.z + direction.z * size * 2,}
-	local node = minetest.env:get_node(np)
-	if node.name ~= "air" then return true end
-	return false
-end
 
 function slime_lonely (pos)
 	objs = minetest.env:get_objects_inside_radius(pos, 32)
@@ -72,7 +65,7 @@ end
 minetest.register_abm({
 	nodenames = {"default:dirt_with_grass"},
 	interval = 10.0,
-	chance = 100000,
+	chance = 10000,
 	action = function(pos, node)
 		minetest.env:add_entity({x=pos.x, y=pos.y+0.75, z=pos.z}, "slimes:small")
 	end,