Light&Shadow

From Lemonade Productions:

Light&Shadow is a challenging puzzle game with a familiar concept and a very different twist. The game is played on a 8x8 board filled with a variety of different game pieces. Each basic piece has a white symbol on one side and a black one on the other - flip them around the board to align rows or columns of four or more white symbols. Each time you align them they will shine up and the board will gain some white energy - you need to build up an amount of this energy to solve a level. But beware! You must be careful not to accidentaly align the black symbols as you move around the board - they will drain the energy you have built up! Combined with clever level design this simple concept will present a real challenge for true puzzle fans.