Sphere Online Judge (SPOJ)

list of riddle problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
10657	LOGIC	9	1494	63.05	5 19
6291	Problem	5	741	29.18	1 30
15019	Strange Pattern (Easy)	8	510	29.30	9 12
17659	Time to get a job	3	453	42.80	12 17
35153	Broken Calculator	2	331	27.36	1 34
6466	Guess the task II	2	181	13.13	11 26
425	Kill evil instantly		164	9.97
22767	CAT and XAT	9	162	51.45	5 6
11784	The Easiest Sequence Of the World!!		143	27.19
15426	Just Guess The Output ! (Very Easy)	1	143	4.23	1 1
19828	Sasha is a noob	3	142	17.47	26 46
13877	LOGIC	3	131	23.88	34 34
17949	Fight with Abhishek	2	129	47.75	34 50
19829	Sasha is a noob v2	2	125	20.06	50 50
19945	Learn to Read	3	107	7.26	12 23
14304	Jaddouic Sequence	2	99	29.40	9 26
20549	Progressions	2	90	48.50	4 11
6467	Guess the task III	2	86	6.65	1 34
12962	External Sequence	3	77	62.40	12 17
15033	Strange Pattern (Medium)		73	13.77	9 9
25741	AMUSING SEQUENCE		62	33.04	1 50
11781	SEQUENCE		58	28.26
15042	Strange Pattern (Impossible)	2	48	18.18	1 30
15034	Strange Pattern (Hard)	1	43	14.11	11 21
17719	Guess The Setters	1	41	48.84	1 1
6469	Guess the task V		38	25.00
15910	Sum The Amazing Series	3	31	27.69	28 39
15784	Coder Express 4!!	1	19	21.85	17 17
15765	N-th Term		13	11.45
31644	No Description 1	2	12	29.79	1 9
15400	Just Guess The Output !	1	7	0.46	1 1
28289	Strange Pattern (Impossible) (Hard)	1	6	8.33	42 26
34160	Strange Pattern (bugged)		4	4.08	34 34
42543	Largest rectangle in a histogram		2	100.00
32000	Under the Spreading Chestnut Tree		1	4.76
36808	Find my favourite	1	1	0.26	1 1
42539	bashing around		0	0.00