diff --git a/audio.lua b/audio.lua
index c580ae0..439b82b 100644
--- a/audio.lua
+++ b/audio.lua
@@ -5,5 +5,8 @@ return {
 	--- Loads an audio file and returns the corresponding audio object.
 	-- TODO: audio object doc & API
 	-- @impl backend
-	load = function(filepath) end
+	load = function(filepath) end,
+
+	-- TODO: doc
+	available = false
 }
diff --git a/backend/ctrulua.lua b/backend/ctrulua.lua
index 13334df..3700043 100644
--- a/backend/ctrulua.lua
+++ b/backend/ctrulua.lua
@@ -51,10 +51,19 @@ end
 uqt.backend = "ctrulua"
 
 -- uqt.event: TODO
+if uqt.event then
+	error("uqt.event: NYI")
+end
 
 -- uqt.draw: TODO
+if uqt.draw then
+	error("uqt.draw: NYI")
+end
 
 -- uqt.audio: TODO
+if uqt.audio then
+	error("uqt.audio: NYI")
+end
 
 -- uqt.time
 if uqt.time then
diff --git a/backend/love.lua b/backend/love.lua
index 3149674..9b095b8 100644
--- a/backend/love.lua
+++ b/backend/love.lua
@@ -105,6 +105,9 @@ add(uqt.draw, {
 		love.graphics.setFont(defaultFont)
 		love.graphics.print(text, x, y)
 	end,
+	point = function(x, y, ...)
+		love.graphics.points(x, y, ...)
+	end,
 	lineWidth = function(width)
 		love.graphics.setLineWidth(width)
 	end,
diff --git a/draw.lua b/draw.lua
index f668bbe..36d3cf1 100644
--- a/draw.lua
+++ b/draw.lua
@@ -68,6 +68,13 @@ draw = {
 	-- @impl backend
 	text = function(x, y, text) end,
 
+	--- Draws a point.
+	-- @tparam number x point x coordinate
+	-- @tparam number y point y coordinate
+	-- @tparam number ... other vertices to draw other points
+	-- @impl backend
+	point = function(x, y, ...) end,
+
 	--- Sets the width.
 	-- @tparam number width the line width
 	-- @impl backend
@@ -154,4 +161,8 @@ draw = {
 	image = function(filename) end,
 }
 
+-- TODO: canvas stuff ; also make everything here actually be shortcut to draw to the game's framebuffer.
+-- TODO: add software implementations of everything.
+-- TODO: add function to draw a message (used eg for the error message when there is a version mismatch)
+
 return draw
diff --git a/init.lua b/init.lua
index a95e1b8..90ff923 100644
--- a/init.lua
+++ b/init.lua
@@ -31,7 +31,7 @@
 -- * Inputs which match ubiquitousse.input.default (a pointing/4 direction input, a confirm button, and a cancel button).
 -- * Some way of measuring time with millisecond-precision.
 -- * Some kind of filesystem.
--- * An available audio output would be preferable.
+-- * An available audio output would be preferable but optional.
 -- * Lua 5.1, 5.2, 5.3 or LuaJit.
 --
 -- Regarding data formats, Ubiquitousse implementations expect and recommend:
@@ -92,6 +92,8 @@ if love then
 	require(p..".backend.love")
 elseif package.loaded["ctr"] then
 	require(p..".backend.ctrulua")
+elseif package.loaded["libretro"] then
+	error("NYI")
 end
 
 return ubiquitousse
diff --git a/input.lua b/input.lua
index 6cc97cb..6832589 100644
--- a/input.lua
+++ b/input.lua
@@ -480,4 +480,10 @@ input.default.pointer = input.pointer()
 input.default.confirm = input.button()
 input.default.cancel = input.button()
 
+-- TODO: some key selection helper? Will be backend-implemented, to account for all the possible input methods.
+-- TODO: some way to list all possible input / outputs, or make the *inUse make some separation between inputs indiscutitably in use and those who are incertain.
+-- TODO: outputs ! (rumble, lights, I don't know)
+-- TODO: other, optional, default/generic inputs, and a way to know if they are binded.
+-- TODO: multiplayer input helpers? something like getting the same input for different players, or default inputs for different players
+
 return input
diff --git a/scene.lua b/scene.lua
index d1260f8..6892117 100644
--- a/scene.lua
+++ b/scene.lua
@@ -45,10 +45,11 @@ scene = {
 	prefix = "",
 
 	--- Creates and returns a new Scene object.
+	-- @tparam[opt="unamed"] string name the new scene name
 	-- @impl ubiquitousse
-	new = function()
+	new = function(name)
 		return {
-			name = "loading scene", -- The scene name.
+			name = name or "unamed", -- The scene name.
 
 			time = time.new(), -- Scene-specific TimerRegistry.
 
diff --git a/todo.txt b/todo.txt
new file mode 100644
index 0000000..0677194
--- /dev/null
+++ b/todo.txt
@@ -0,0 +1,17 @@
+Ubiquitousse, also known as "The World's Best Video Game Engine Of All Time", despite its perfectness, is still not perfect.
+More specifically, what is lacking to officially turn Ubiquitousse into a sacred text, is:
+- An i18n API. While some languages are clearly superior to others, the general consensus seems to think otherwise. Ubiquitousse
+  should be able to get an ordered list of prefered languages and provide translation helpers.
+- Some API are still lacking an API and/or implementation. Search "TODO" for more information.
+- A filesystem API, to access the game's filesystem. May also rewrite Lua's io functions, see the next item.
+- A sandboxing system. Ubiquitousse should be able to run in a Ubiquitousse game safely. Since Ubiquitousse can run itself, it will
+  then seems reasonable to claim Ubiquitousse run the universe. See World Domination for Dummies.
+- A libretro backend, so Ubiquitousse really become ubiquitous. If you didn't know, it's the goal.
+- Maybe some compatibilty layer for different Lua versions.
+- Some network access. Ubiquitousse needs to spread.
+- Weird APIs to allow the backend to manipulate more efficiently the game:
+  - Memory / environment access.
+  - State saving / Time travel API. Real world Time Travel is optional but preferable.
+- Test suite. Ubiquitousse should run perfectly. Including pixel-perfect image output. "Namého".
+- At least a million followers and their souls.
+- Sacrifices. A lot of them.