Kotelonmodaus on sitä että muutetaan tavallinen tietokoneen kotelo näyttämään joltain ihan muulta kuin tietokenekotelolta.
Tässä hyvännäköinen modaus projekti DOOM 3: Project Mars City Mod se aloitettu jo syyskuun alussa 2004 ja projekti on edelleenkin kesken tätä kirjoitettaessa.
Myös huomionarvoinen modaus on Blackmesa HL² Kuva löytyy ainakin täältä mikäli tuo suoraan linkitetty kuva ei pelaa 
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