Yes, this is single player.
Also includes a slightly updated 1337 Board v3++
1337 Board so you can play like Street Figher(1vs1 Maps) or classic sky camera from Zelda(For Dungeon Map)

Download:
[url]http://files.filefront.com/1vs1+Map+Packzip/;12561876;/fileinfo.html[/url]
or
[url]http://www.moddb.com/mods/elements-of-war/addons/eow-1vs1-map-pack-hl2[/url]

HL2 1vs1 Map Pack
Maps:
1vs1-Crystal
1vs1-Dungeon
1vs1-Void
EoWxCrystalDuel
EoWxDungeon
EoWxVoid2

1337 Board v3++(Slightly Updated)
Changes the keyboard menu of Half-Life and Half-Life 2.
Camera views:
- First Person
- Third Person
- Side Views
- Top Down Views
- Create Your Own
Change sensitivity levels (Mouse/Joystick)
Joystick options:
- Left stick AIM / Right MOVE
- Left stick MOVE / Right AIM
Many other hotkey options.