add a brief explanation about the stage, in wich game it appeared and other important stuff.
NOTE: If needed, you can use the Loading Screen of that stage for this section, such as "Within this searing crucible writhes a vengeful demon: Viper, whose fiery fury grows and threatens to engulf everything..." from Biochem Plant (but only as a last resort.
Copy/paste the game's briefing to this section.
Add all the information gathered of that stage here, explaining how many enemies you will find (and wich ones you will find), how to the Boss and more.
Does this mission have a Boss that appear during the middle of the field? Add his information here.
Add the information about the Boss that you are going to face during the final minutes of that mission here. Either his attacks or how you can beat him.