diff --git a/atlantis_dyp.lua b/atlantis_dyp.lua
--- a/atlantis_dyp.lua
+++ b/atlantis_dyp.lua
@@ -173,7 +173,7 @@ dyp_obelisk_puzzle = room {
             end;
             local k = 1;
             for i = 1, 16 do
-                if s.state[i] == 1 then
+                if s.state[i] ~= 12 then
                     for j = i + 1, 16 do
                         if s.state[i] > s.state[j] and s.state[j] ~= 12 then
                             k = k + 1;
@@ -183,7 +183,7 @@ dyp_obelisk_puzzle = room {
                     k = k + math.floor(i / 4);
                 end;
             end;
-            if k % 2 == 0 then
+            if k % 2 == 1 then
                 for i = 16, 1, -1 do
                     if s.state[i] == 14 then
                         s.state[i] = 15;