Rambler's Top100
Answer for 1st round
1. Mirrored fence

Illustration for puzzle 1

Answer: 70
2. Butterflies

Illustration for puzzle 2

Answer: ++B++C+B++, AAA++C+B++
3. Offset sudoku

Illustration for puzzle 3

Answer: 9316459
4. Crawling snake

Illustration for puzzle 4

Answer: S+SSSSSSSS
5. Battleships - palindrome

Illustration for puzzle 5

Answer: ++DDD++D+D, +++++D++++
6. Star sudoku
Illustration for puzzle 6

Answer: 2718496S35
7. Summed patience

Illustration for puzzle 7

Answer: 9C, 2H, 5D, 8H
8. A-B-C loop

Illustration for puzzle 8

Answer: A10, G9, B8, D7, G7, A5, G5, J5, C4, F3, D2, J1
9. Residential
Illustration for puzzle 9

Answer: 02510634
10. Penta-dominoes

It is possible to put 12 ptnaminoes.
Illustration for puzzle 10

Score:12
Answer:F-i11-g12, F-i6-k5, F-k12-m11, P-c3-e2, P-i9-k8, P-l2-m4, T-f6-f4, T-h2-j2, T-m7-o7, V-c6-a7, V-d11-c9, V-f8-g10
11. OX

Best solution has seven X and sixteen O.
Illustration for puzzle 11

Score:12
Answer:37:d10,g13,j16,m13,p10,m7,j4; a10,d13,g16,j19,d7,g10,j13,m16, g4,j7,m10,p13,j1,m4,p7,s10
12. Colobox's path

Maximum finded length is 68.
Illustration for puzzle 12

Score:12.67
Answer:7415623, 5741362, 6327145, 2173456, 1652734, 3564271, 4236517; g5-e5-e7-g7-g4-a4-a7-d7-d1-a1-a3-g3-g1-e1-e5-b5-b2-f2-f6-c6-c1