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Top Secret is a platform game played out on individual screens, each with a number of disks to collect. There are various enemies on the screen, which must be hit a number of times to be stopped. The ground-based creatures can then be walked over for points, while the birds simply stop for a few seconds. Your weapons have an arc similar to Kid Gloves, meaning that they hit the ground then rebound to a lower height, making precision aiming important.
The level layouts are similar to Rodland, with gaps between platforms, and your character glides in a similar way - some of the disks are suspended in mid-air, and you must control the character's fall to pass over these - thankfully your character isn't harmed by falling. A number of bonus items are on offer, including extra points, extra lives and invincibility.