diff --git a/Lua/A common.lua b/Lua/A common.lua
index cfffecc..c0b9c60 100755
--- a/Lua/A common.lua	
+++ b/Lua/A common.lua	
@@ -232,6 +232,11 @@ return {
     bomb_counter        = AG(0x1CD4, 1),
     z_cursor_actor      = AG(0x1DF8, 4),
     z_target_actor      = AG(0x1DFC, 4),
+    current_scene_flags_2 = AG(0x1E58, 4), -- note: I use SRAM ordering here
+    current_scene_flags_3 = AG(0x1E5C, 4),
+    current_scene_flags_1 = AG(0x1E68, 4),
+    current_scene_flags_4 = AG(0x1E6C, 4),
+    current_scene_flags_5 = AG(0x1E74, 4),
 
     link_actor = merge(Actor(AA(0,0).addr), {
         item_in_hand    = AA(0x148, 1),
diff --git a/Lua/addrs.lua b/Lua/addrs.lua
index 3a0246b..74e134b 100755
--- a/Lua/addrs.lua
+++ b/Lua/addrs.lua
@@ -1,4 +1,4 @@
-versions = {
+versions = { -- sha1 hashes of .z64s
     ['D6133ACE5AFAA0882CF214CF88DABA39E266C078'] = "US10",
     ['2F0744F2422B0421697A74B305CB1EF27041AB11'] = "USDE",
     ['9743AA026E9269B339EB0E3044CD5830A440C1FD'] = "USGC",
diff --git a/Lua/count flags.lua b/Lua/count flags.lua
new file mode 100755
index 0000000..63df48b
--- /dev/null
+++ b/Lua/count flags.lua	
@@ -0,0 +1,34 @@
+require "addrs"
+
+-- precalculate hamming weights of bytes
+hamming_weight = {}
+for i = 0, 255 do
+    local w = 0
+    for b = 0, 7 do
+        w = w + bit.band(bit.rshift(i, b), 1)
+    end
+    hamming_weight[i] = w
+end
+
+function hamming_of(addr, size)
+    weight = 0
+    bytes = mainmemory.readbyterange(addr, size)
+    for k,v in pairs(bytes) do
+        if v ~= 0 then
+            weight = weight + hamming_weight[tonumber(v, 16)]
+        end
+    end
+    return weight
+end
+
+print("###")
+local current = 0
+for i = 1, 5 do
+    local addr = addrs['current_scene_flags_'..tostring(i)].addr
+    current = current + hamming_of(addr, 4)
+end
+local ingame = hamming_of(addrs.scene_flags_ingame.addr, 0x960)
+local save   = hamming_of(addrs.scene_flags_save.addr,   0x960)
+print("current", current)
+print("ingame ", ingame)
+print("save   ", save)