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diff --git a/TODO b/TODO
index 24b5fa6..e696b98 100644
--- a/TODO
+++ b/TODO
@@ -6,8 +6,6 @@
 
 * Make a way to save and load games.
 
-* Make extra hard puzzle generation fast.
-
 * After porting ooStudy into Go,
   collect data through python. Particularly: