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Global Defense is a video game developed by Sega for the Master System console.

The game is set in a futuristic world where the player takes on the role of a military commander tasked with defending the Earth from an alien invasion.

The gameplay in Global Defense is divided into two main parts: a strategic map where the player must make decisions on how to allocate resources and deploy troops, and a tactical map where the player must control their units in real-time battles against the alien forces.

On the strategic map, the player must manage a number of different resources including money, energy, and soldiers.

The player must make decisions on how to allocate these resources to different regions of the Earth in order to best defend against the alien invasion.

This includes building new military bases, upgrading existing ones, and deploying troops and weapons to different regions.

When the player encounters an alien invasion on the strategic map, they must enter the tactical map to engage in real-time battles against the aliens.

The tactical map is a top-down view of the battlefield and the player must control their units and use different weapons and tactics to defeat the aliens.

The player must manage their units' health and energy, and use different weapons and abilities to defeat the aliens.

The player can also call in airstrikes and other special attacks to help turn the tide of battle.

These special attacks are powerful and can cause massive damage to the alien forces, but they also cost a lot of resources.

The player must balance the use of these special attacks with the need to conserve resources for future battles.

The player can also earn bonuses for capturing alien technology and using it to improve their own units and weapons.

This adds an extra layer of strategy to the game as the player must decide which alien technology to pursue and how to use it to best advantage.

Overall, Global Defense is a challenging and engaging game that combines elements of strategy and real-time action.

The player must make tough decisions on resource allocation and troop deployment while also engaging in intense battles against the alien invaders.

The game's challenging gameplay, engaging storyline, and futuristic setting make it a classic of the Master System library.