diff --git a/main.lua b/main.lua
index c6aa93e..f6db737 100644
--- a/main.lua
+++ b/main.lua
@@ -265,7 +265,7 @@ local function normalize_wrt(x, s, out)
     return out
 end
 
--- game-agnostic stuff (i.e. the network itself)
+-- network parameters.
 
 package.loaded['nn'] = nil -- DEBUG
 local nn = require("nn")
@@ -302,9 +302,8 @@ end
 
 -- and here we go with the game stuff.
 
---[[
-https://gist.githubusercontent.com/1wErt3r/4048722/raw/59e88c0028a58c6d7b9156749230ccac647bc7d4/SMBDIS.ASM
---]]
+-- disassembly used for reference:
+-- https://gist.githubusercontent.com/1wErt3r/4048722/raw/59e88c0028a58c6d7b9156749230ccac647bc7d4/SMBDIS.ASM
 
 local rotation_offsets = { -- FIXME: not all of these are pixel-perfect.
     0, -40, -- 0
@@ -553,6 +552,8 @@ local function handle_tiles()
     end
 end
 
+-- learning and evaluation.
+
 local function prepare_epoch()
     print('preparing epoch '..tostring(epoch_i)..'.')
     base_params = network:collect()
@@ -708,7 +709,6 @@ local function do_reset()
     screen_scroll_delta = 0
     emu.frameadvance() -- prevents emulator from quirking up.
 
-    --print()
     load_next_trial()
 
     reset = false
@@ -728,16 +728,13 @@ local function init()
     if res == false then print(err) end
 end
 
-init()
-
-local dummy_softmax_values = {0, 0}
-
 local function doit(dummy)
     local ingame_paused = get_state() == "paused"
 
     -- every few frames mario stands still, forcibly decrease the timer.
     -- this includes having the game paused.
     -- TODO: more robust. doesn't detect moonwalking against a wall.
+    -- well, that shouldn't happen anymore now that i've disabled left+right.
     local timer = get_timer()
     if ingame_paused or random() > 1 - timer_loser and R(0x1D) == 0 and R(0x57) == 0 then
         timer = timer - 1
@@ -764,8 +761,7 @@ local function doit(dummy)
     empty(tile_input)
     empty(extra_input)
 
-    -- player
-    -- TODO: check if mario is playable.
+    -- TODO: check if mario is in a playable state.
     local x, y = getxy(0, 0x86, 0xCE, 0x6D, 0xB5)
     local powerup = R(0x754)
     local status = R(0x756)
@@ -800,10 +796,7 @@ local function doit(dummy)
 
     if not ingame_paused then reward = reward + reward_delta end
 
-    --gui.text(4, 12, ("%02X"):format(#sprite_input), '#FFFFFF', '#0000003F')
-    --gui.text(4, 22, ("%02X"):format(#tile_input), '#FFFFFF', '#0000003F')
     --gui.text(72, 12, ("%+4i"):format(reward_delta), '#FFFFFF', '#0000003F')
-    --gui.text(112, 12, ("%+4i"):format(reward), '#FFFFFF', '#0000003F')
     gui.text(96, 16, ("%+4i"):format(reward), '#FFFFFF', '#0000003F')
 
     if get_state() == 'dead' and state_old ~= 'dead' then
@@ -811,6 +804,7 @@ local function doit(dummy)
         if R(0x75A, 0) == 0 then reset = true end
     end
     if get_state() == 'lose' then
+        -- this shouldn't happen if we catch the deaths as above.
         print("ran out of lives.")
         reset = true
     end
@@ -867,6 +861,8 @@ local function doit(dummy)
     score_old = get_score()
 end
 
+init()
+
 while true do
     gui.text(4, 12, get_state(), '#FFFFFF', '#0000003F')