Scenarios

It's been said that anyone can design a game, but the real developers create scenarios.  The battle of Seven Pines / Fair Oaks has several ways to approach it.  These are all given their own scenarios and variations in the game.  Additionally, the days bookending the main battle have interesting skirmishes and small-scale engagements that are good for learning the system and playing with a smaller number of maps and counters.

Below are some of the scenarios that are included with The Devil's Own Fun.  Most of them use only one or two maps.  Only the grand campaign game uses all 13 maps.
Battle at the Adam's House
Late in the day on 31 May, Johnston received word that a general engagement had been raging.  He panicked somewhat, taking direct command of The Left Wing and moving Whiting's three brigades into combat north of Fair Oaks Station.  The force on the Union right consisted primarily of picket and a couple of Abercrombie's Regiments.  If not for the arrival of Sumner's Corps around 6:00 PM, the Union right would have crumbled. 
First Battle of Mechanicsville
Before the Seven Day's Battles, there was a skirmish at this small crossroads.  On 24 May 1862, McClellan sent a small brigade to clear the Chickahominy's north bank of Rebels and destroy the Mechanicsville Bridge.
First Battle of Seven Pines
An earlier reconnaissance by the Federal IV Corps discovered a strong Confederate presence on the Williamsburg Road.  General Casey was ordered to send five regiments of infantry, one of cavalary and  two batteries to get a better sense of the force in their front.  From mid-morning through the afternoon, they fought their way forward, finally stopping short of the Seven Pines as Keyes wanted to avoid a general confrontation.
The Battle of Seven Pines Day 1
The Battle of Seven Pines Day 2
The Battle of Seven Pines Campaign
Fight at The Twin Houses
About a mile below Fair Oaks Station, at the crossroads of the Williamsburg and Nine Mile Roads, D.H. Hill's Division swept over Casey's Division and camp.  There were some fierce pockets of fighting at the redoubt, at the woodpile and around the twin houses (Kuhn).  Only the timely intervention of Kearny's Division (Berry's and Birney's Brigades) saved the day.

This is the point where the Confederates applied the most pressure.  Unfortunately, the pressure came serially (i.e. one brigade behind another) rather than parallel (where multiple brigades enveloped and engulfed the III Corps).
Longstreet Takes the Wrong Street
In the actual battle, Joe Johnston thought that he had briefed his generals thoroughly.  Even so, Major General James Longstreet decided to attack down the Williamsburg Road rather than the Nine Mile Road as expected.  This resulted in delays as well as an unmolested Union Right and a narrow attack front which prevented all of the brigades from engaging.

In this scenario, Longstreet is forced to attack behind Hill up the Williamsburg Turnpike.