Its just like BYOND, you can Build your own Game for Off/Online use. It's simple and has a 300 page tutorial. It also features an F1 short cut to the guide. Instead of using "//" for comments you use "REM" heres a little programming I just did:

REM 'Castlevania Online'



REM --- INITIALISE ---
OPEN WINDOW 320,200
IMAGE PASTE 0,0,0
SPRITE COLOUR KEY ON
SPRITE 1 , 160 , 198 , 0
SPRITE 2 , 0 , 100 , 11
SPRITE 3 , 0 , 100 , 11
Sprite Auto Hotspot 1,20
Sprite Auto Hotspot 2, 20
Sprite Auto Hotspot 3, 20

REM --- SET UP ANIMATIONS ---
FuzzyRunRight$="Image 1:Move 3,0:Image 2:Move 3,0:Image 3:Move 3,0:Image 4:Move 3,0:Image 5:Move 3,0:Image 6:Move 3,0:Image 7:Move 3,0:Image 8:Move 3,0:Image 9:Move 3,0:Image 10:Move 3,0:Loop 0"
AutoChannel 0,FuzzyRunRight$
AutoChannel off 0
AutoChannel To Sprite 0,0,1
FuzzyRunLeft$="Image 1:Move -3,0:Image 2:Move -3,0:Image 3:Move -3,0:Image 4:Move -3,0:Image 5:Move -3,0:Image 6:Move -3,0:Image 7:Move -3,0:Image 8:Move -3,0:Image 9:Move -3,0:Image 10:Move -3,0:Loop 0"
AutoChannel 1,FuzzyRunLeft$
AutoChannel off 1
AutoChannel To Sprite 1,0,1
AutoUpdate On

REM --- MAIN PROGRAM LOOP ---
DO
IF Inkey$="q" THEN break
IF KeyState( 39 ) and spritecollision(1)<>3
AutoChannel On 0
AutoChannel off 1
SPRITE MIRROR OFF X 1
ELSE IF KeyState( 37 ) and spritecollision(1)<>2
AutoChannel off 0
AutoChannel On 1
SPRITE MIRROR X 1
ELSE
AutoChannel off 0
AutoChannel off 1
SPRITE 1 , , , 0
ENDIF
WAIT UPDATE END
LOOP