In this installment we’ll be taking a look at artificial intelligence in the Blender game engine.
How to get an enemy to roam around the level?
How to get the enemy to recognise the player?
How to get an enemy to pursue the player?
What happens when the enemy loses sight of the enemy?
You can find the blend file for the game prototype blockout with this enemy AI implemented HERE.
Also thank you to everyone who offered feedback however small. It was a huge help and immensely encouraging! Thank you again! 
For more posts in the series including the Game Design Document for this project check here.
EasyEmit Particles addon blender artists thread for the game engine can be found here.
For more helpful information for getting into the blender game engine logic and scripting check out these tutorials here.
And especially this introduction here.
Be careful with this stuff, with enough logic bricks Blender might become self aware. Aidy