Sjoerd "Hourences" De Jong is a Mapper, Texture Artist and Modeller who has worked on Unreal Engine 1 projects such as Xidia Gold and Operation: Na Pali and has worked with Epic Megagames on Unreal Tournament 2004 as well as professional games such as The Ball. He is well known in the Unreal community for producing grandiose and atmospheric maps, a well as starting all new themes such as the "Ice Skaarj theme".
- Xidia Gold - 3 Maps
- Operation: Na Pali - 4 Maps (2 co-authored)
- Xidia Gold - 4 Texture Packs
- Operation: Na Pali - 1 Texture Pack (co-authored)
- Xidia Gold