Sphere Online Judge (SPOJ)

list of riddle problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
425	Kill evil instantly		164	10.01
6291	Problem	5	739	29.15	1 30
6466	Guess the task II	2	179	13.15	11 26
6467	Guess the task III	2	86	6.66	1 34
6469	Guess the task V		38	25.16
10657	LOGIC	9	1486	63.05	5 19
11781	SEQUENCE		56	28.25
11784	The Easiest Sequence Of the World!!		143	27.54
12962	External Sequence	3	77	62.40	12 17
13877	LOGIC	3	131	24.07	34 34
14304	Jaddouic Sequence	2	98	29.21	9 26
15019	Strange Pattern (Easy)	8	508	29.25	9 12
15033	Strange Pattern (Medium)		72	13.61	9 9
15034	Strange Pattern (Hard)		42	13.86	13 21
15042	Strange Pattern (Impossible)	2	48	18.18	1 30
15400	Just Guess The Output !	1	7	0.46	1 1
15426	Just Guess The Output ! (Very Easy)	1	143	4.24	1 1
15765	N-th Term		13	11.95
15784	Coder Express 4!!	1	19	21.85	17 17
15910	Sum The Amazing Series	3	31	30.00	28 39
17659	Time to get a job	3	450	42.76	12 17
17719	Guess The Setters	1	41	48.84	1 1
17949	Fight with Abhishek	2	129	47.75	34 50
19828	Sasha is a noob	3	142	17.70	26 46
19829	Sasha is a noob v2	2	124	20.06	50 50
19945	Learn to Read	3	107	7.28	12 23
20549	Progressions	2	88	47.98	4 11
22767	CAT and XAT	9	160	51.17	5 6
25741	AMUSING SEQUENCE		48	31.18	1 50
28289	Strange Pattern (Impossible) (Hard)	1	6	8.33	42 26
31644	No Description 1	2	12	29.79	1 9
32000	Under the Spreading Chestnut Tree		1	4.76
34160	Strange Pattern (bugged)		4	4.08	34 34
35153	Broken Calculator	2	329	27.40	1 34
36808	Find my favourite	1	1	0.26	1 1
42539	bashing around		0	0.00
42543	Largest rectangle in a histogram		0	0.00