Update

Updated game engine
Made some tweaks in code
Made some tweaks in graphics
Some improvements in gallery
Added navigation with arrow keys in gallery
Replaced images with croped left side
Some another various improvements and tweaks
Added 6 new skins of card's back side in "Memory Game" mode
Added 1 new skin of card's forward side in "Memory Game" mode
Added help to puzzle mode
Added help to memory game mode
Added achievements