국어문법의연구 Volume 2 of Kugŏ munpŏp ŭi tʻamgu, Ki-sim Nam,
What stands out about this activity book is the humor sprinkled in the puzzles.
Item Tag: 태학사
국어문법의연구 Volume 1 of Kugŏ munpŏp ŭi tʻamgu, Ki-sim Nam
This activity book includes tangram puzzles that challenge spatial reasoning.