1 We throw a coin

by baily

2 Re: Pythagorea

by baily

3 Legible lines

by Serge

4 Pythagorea

by

5 Magic age

by AlexGin

7 Problem on

by Vain

8 Such here the task

by Kaifa

11 Re: a tendency, however!

by Maniacal

12 Re: three

by Ejnstok Fajr

14 Triangle from stick slices

by rg45 ( Pages 1 2 )

15 QR-code

by Erop ( Pages 1 2 3 )

16 Fruit

by anonymous

17 All shades of the white.

by NovaMind

22 Cool problem

by bzig

24 Parameters

by Serge

28 Swap

by Titus

30 volatile-only lock

by nikholas