WinXplosion fruitmachine by Eurocazino.
Play at bet x40 on reel 1, 2, 3 and 4 on paylines 1 through 14. With 4 Xplosion symbols on line, the Xplosion ladder starts. Each press of the button gives a chance of a step in the ladder. Try WinXplosion online for free and fullscreen.