Compared to Ksudoku, GNOME Sudoku is much slower to play. The way the mouse is handled in Ksudoku is 10 times better - you have a list of numbers on the left. When you click a number, it becomes the active number. When you left click in a block (in the game area), the active number is placed inside that block. When you right click in a block, it is added as a hint. When you left / right click again, the active number is removed from that block. The only disadvantage of Ksudoku in a Gnome desktop environment is the time it takes to load due to the KDE libraries needed.