Fushido is inspired of the original game called Ishido. Hence the basic aim is to make lines and/or columns with pieces that will be proposed. Once a line or a column is full, it disappears, leaving the cells it covered “marked”. Depending on the game mode, the next level is reached once enough cells or lines are “marked”.
Well, but you cannot place pieces arbitrarily. Each piece must be placed next to at least 1 previously placed one (at its up, left, down or right). Furthermore, 2 adjacent shapes must have the same colour or the same shape (i.e. icon inside the ball).