Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zen Puzzle Garden is NP-complete   Zen Puzzle Garden (ZPG) is a one-player puzzle game. In this paper, we prove
that deciding the solvability of ZPG is NP-complete.

19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin