BlazingTools Boss Invisible lets you hide the game or browser window by simply moving your mouse pointer to the bottom-right corner of the screen. To bring your window back into view you just need to move the mouse back to that corner again. The software also hides your secret window pages from the Task Manager and removes them from the system tray. Boss Invisible itself works in stealth mode and is very much easy to use and customize.
BlazingTools Boss Invisible costs 4.95 USD.