| Map | Title | Author | Players | |
|---|---|---|---|---|
| ONS-Caelum | Caelum | Unknown | ||
| ONS-Caldera | ONS-Caldera | 8-12 | ||
| ONS-Calliope | The Calliope Archipelago | 10-18 | ||
| ONS-Camo | Camo | 16-24 | ||
| ONS-Cancer_Sticks | ONS-Cancer_Sticks | 12-20 | ||
| ONS-CanyonRun | Canyon Run | 8-16 | ||
| ONS-CanyonRunSE | Canyon Run SE | 8-16 | ||
| ONS-CaptainGordons_Box_of_Pwnage-RC1 | ONS-CaptainGordons_Box_of_Pwnage-RC1 | Unknown | ||
| ONS-CaptainSors_Island_of_Pwnage_C | Captain_Sor's_Island_of_Pwnage | 16-32p | ||
| ONS-CataldiPark | Cataldi Park | 10-16 | ||
| ONS-CBP2-Argento | Argento Del Alma | 8-14 | ||
| ONS-CBP2-Brassed | CBP2 - Brassed | 8-16 | ||
| ONS-CBP2-Pasargadae | Pasargadae | 8-12 | ||
| ONS-CBP2-Valarna | Valarna | 10-18 | ||
| ONS-CBP2-Valarna-ECE | Valarna | 10-18 | ||
| ONS-Celebis | Celebis | 12-16 | ||
| ONS-Celebis | Celebis | 12-16 | ||
| ONS-ChainsIsileFinal | ChainsIsile | 4-8 | ||
| ONS-ChainsIsle2 | ONS-ChainsIsle2 | 4 | ||
| ONS-ChainsIsle2-T32-beta1 | ONS-ChainsIsle2-T32-beta1 | 4 | ||
| ONS-chill5 | Battlezone Chill | Unknown | ||
| ONS-Cinder | ONS-Cinder | 6 | ||
| ONS-ClosedCanyon | The Closed Canyon | Unknown | ||
| ONS-CobraPass | Cobra Pass | 4-6 | ||
| ONS-ColdFusion | Cold Fusion | 10-16 | ||
| ONS-ColdFusion][ | Cold Fusion | 10-16 | ||
| ONS-Coldsteel | Coldsteel winter country | 12-18 | ||
| ONS-ColdTorlan | Men, its Cold | 12-20 | ||
| ONS-Combat2600 | ONS-Combat2600 | Unknown | ||
| ONS-Commando | ONS-Commando | Unknown | ||
| ONS-ConcealedRespite | ONS-ConcealedRespite | 16 | ||
| ONS-ConcealedRespite2 | ONS-ConcealedRespite | 16 | ||
| ONS-ConcealedRespite2-ECE | ONS-ConcealedRespite | 16 | ||
| ONS-ConclaveCanyon | Conclave Canyon | 12-24 | ||
| ONS-CosimiaFINAL | CosimiaFINAL | 8-14 | ||
| ONS-CosimiaSE | CosimiaSE | 8-12 | ||
| ONS-CourtsOfChaos | Courts Of Chaos | 8-14 | ||
| ONS-CrashFlight | Crash Flight | 4-24 | ||
| ONS-CrashFlight | ONS-Crash Flight | 24 | ||
| ONS-Crater | Small Crater | Unknown | ||
| ONS-Craterious-Zeta | ONS-Craterious-Zeta | 10-16 | ||
| ONS-CrazyCity | ONS-CrazyCity | Unknown | ||
| ONS-Crossfire-SLE | Crossfire | 10-18 | ||
| ONS-CrossingRoads | Crossing Roads | Unknown | ||
| ONS-Cruiser_VL-5 | Cruiser VL-5 | 8-12 | ||
| ONS-CTCanyonRun | Cold Canyon | 12-16 |