Moving the left analog stick forward will trigger the
classic breaststroke movement, and holding X
whilst doing so will force CJ to switch to freestyle
mode.
Each level has a number of different
modes available, with single - player only «
classic» (standard tower defense) and «rescue» (sees you protecting a stream of vulnerable units); as well as «skirmish» (where your base pumps out units that head straight for the enemy's base
whilst you must still defend your own), «capture the flag» (where you build a special unit to capture a flag) and «territory» (where you try to dominate by «painting» as much of the landscape as possible).