diff --git a/minetestforfun_game/game_api.txt b/minetestforfun_game/game_api.txt
index 5b9a1851..205326da 100644
--- a/minetestforfun_game/game_api.txt
+++ b/minetestforfun_game/game_api.txt
@@ -81,7 +81,7 @@ farming.register_plant(name, Plant definition)
 	steps = 8,	-- How many steps the plant has to grow, until it can be harvested
 	^ Always provide a plant texture for ech step, format: modname_plantname_i.png (i = stepnumber)
 	minlight = 13, -- Minimum light to grow
-	maxlight = LIGHT_MAX -- Maximum light to grow
+	maxlight = default.LIGHT_MAX -- Maximum light to grow
 }
 
 Stairs API
@@ -150,6 +150,11 @@ default.node_sound_wood_defaults()
 default.node_sound_leaves_defaults()
 default.node_sound_glass_defaults()
 
+Default constants
+-----------------
+default.LIGHT_MAX
+^ The maximum light level (see [Node definition] light_source)
+
 Player API
 ----------
 The player API can register player models and update the player's appearence
@@ -274,4 +279,15 @@ minetest.register_craft({
 dye.basecolors
 ^ Array containing the names of available base colors
 dye.excolors
-^ Array containing the names of the available extended colors
\ No newline at end of file
+^ Array containing the names of the available extended colors
+
+Trees
+-----
+default.grow_tree(pos, is_apple_tree)
+^ Grows a tree or apple tree at pos
+
+default.grow_jungle_tree(pos)
+^ Grows a jungletree at pos
+
+default.grow_pine_tree(pos)
+^ Grows a pinetree at pos
diff --git a/minetestforfun_game/mods/default/nodes.lua b/minetestforfun_game/mods/default/nodes.lua
index c5ce5719..bf3b434f 100644
--- a/minetestforfun_game/mods/default/nodes.lua
+++ b/minetestforfun_game/mods/default/nodes.lua
@@ -774,7 +774,7 @@ minetest.register_node("default:water_flowing", {
 			animation={type = "vertical_frames", aspect_w= 16, aspect_h = 16, length = 0.6}
 		},
 	},
-	alpha = WATER_ALPHA,
+	alpha = 160,
 	paramtype = "light",
 	paramtype2 = "flowingliquid",
 	walkable = false,
@@ -786,7 +786,7 @@ minetest.register_node("default:water_flowing", {
 	liquidtype = "flowing",
 	liquid_alternative_flowing = "default:water_flowing",
 	liquid_alternative_source = "default:water_source",
-	liquid_viscosity = WATER_VISC,
+	liquid_viscosity = 1,
 	freezemelt = "default:snow",
 	post_effect_color = {a = 120, r = 20, g = 60, b = 80},
 	groups = {water= 3, liquid = 3, puts_out_fire = 1, not_in_creative_inventory = 1, freezes = 1, melt_around = 1},
@@ -807,7 +807,7 @@ minetest.register_node("default:water_source", {
 			backface_culling = false,
 		}
 	},
-	alpha = WATER_ALPHA,
+	alpha = 160,
 	paramtype = "light",
 	walkable = false,
 	pointable = false,
@@ -818,7 +818,7 @@ minetest.register_node("default:water_source", {
 	liquidtype = "source",
 	liquid_alternative_flowing = "default:water_flowing",
 	liquid_alternative_source = "default:water_source",
-	liquid_viscosity = WATER_VISC,
+	liquid_viscosity = 1,
 	freezemelt = "default:ice",
 	post_effect_color = {a = 120, r = 20, g = 60, b = 80},
 	groups = {water= 3, liquid = 3, puts_out_fire = 1, freezes = 1},
@@ -906,7 +906,7 @@ minetest.register_node("default:lava_flowing", {
 	},
 	paramtype = "light",
 	paramtype2 = "flowingliquid",
-	light_source = LIGHT_MAX,
+	light_source = default.LIGHT_MAX - 1,
 	walkable = false,
 	pointable = false,
 	diggable = false,
@@ -916,7 +916,7 @@ minetest.register_node("default:lava_flowing", {
 	liquidtype = "flowing",
 	liquid_alternative_flowing = "default:lava_flowing",
 	liquid_alternative_source = "default:lava_source",
-	liquid_viscosity = LAVA_VISC,
+	liquid_viscosity = 7,
 	liquid_renewable = false,
 	damage_per_second = 8,
 	post_effect_color = {a = 220, r = 250, g = 70, b = 20},
@@ -939,7 +939,7 @@ minetest.register_node("default:lava_source", {
 		}
 	},
 	paramtype = "light",
-	light_source = LIGHT_MAX,
+	light_source = default.LIGHT_MAX - 1,
 	walkable = false,
 	pointable = false,
 	diggable = false,
@@ -949,7 +949,7 @@ minetest.register_node("default:lava_source", {
 	liquidtype = "source",
 	liquid_alternative_flowing = "default:lava_flowing",
 	liquid_alternative_source = "default:lava_source",
-	liquid_viscosity = LAVA_VISC,
+	liquid_viscosity = 7,
 	liquid_renewable = false,
 	damage_per_second = 8,
 	post_effect_color = {a = 220, r = 250, g = 70, b = 20},
diff --git a/minetestforfun_game/mods/default/trees.lua b/minetestforfun_game/mods/default/trees.lua
index 476490c2..c146b41c 100644
--- a/minetestforfun_game/mods/default/trees.lua
+++ b/minetestforfun_game/mods/default/trees.lua
@@ -45,7 +45,7 @@ minetest.register_abm({
 
 		minetest.log("action", "A jungle sapling grows into a tree at "..
 				minetest.pos_to_string(pos))
-		default.grow_jungletree(pos)
+		default.grow_jungle_tree(pos)
 	end
 })
 
@@ -60,7 +60,7 @@ minetest.register_abm({
 	
 	minetest.log("action", "A pine sapling grows into a tree at "..
 		minetest.pos_to_string(pos))
-		default.grow_pinetree(pos)
+		default.grow_pine_tree(pos)
 	end
 })
 	
@@ -157,14 +157,14 @@ end
 
 -- Jungletree
 
-function default.grow_jungletree(pos, bad)
+function default.grow_jungle_tree(pos, bad)
 	--[[
 		NOTE: Jungletree-placing code is currently duplicated in the engine
 		and in games that have saplings; both are deprecated but not
 		replaced yet
 	--]]
 	if bad then
-		error("Deprecated use of default.grow_jungletree")
+		error("Deprecated use of default.grow_jungle_tree")
 	end
 
 	local x, y, z = pos.x, pos.y, pos.z
@@ -220,7 +220,7 @@ local function add_snow(data, vi, c_air, c_ignore, c_snow)
 	end
 end
 
-function default.grow_pinetree(pos)
+function default.grow_pinet_ree(pos)
 	local x, y, z = pos.x, pos.y, pos.z
 	local maxy = y + random(9, 13) -- Trunk top
 
@@ -340,4 +340,4 @@ function default.grow_pinetree(pos)
 	vm:set_data(data)
 	vm:write_to_map()
 	vm:update_map()
-end
\ No newline at end of file
+end