square numbers in 5 seconds

Easy Entry

100

4 x 4

16

200

13 x 13

169

300

15 x 15

225

400

16 x 16

256

500

17 x 17

289

Medium entry

100

19 x 19

361

200

20 x 20

400

300

23 x 23

529

400

24 x 24

576

500

29 x 29

841

Challenge

100

34 x 34

1156

200

45 x 45

2025

300

66 x 66

4356

400

111 x 111

12321

500

126 x 126

16129

Impossible

100

177 x 177

31329

200

185 x 185

34225

300

203 x 203

41209

400

314 x 314

98596

500

428 x 428

183184