| Track No. | Track Title | Version | Composer | Album | Album ID | |
|---|---|---|---|---|---|---|
| 15 | Tough Challenge | main | Narholz, Gregor F. | Commercial Length Cuts 11 | CLC-11 | |
| 15 | Tough Challenge | commercial | Narholz, Gregor F. | Commercial Length Cuts 11 | CLC-11 | |
| 15 | Tough Challenge | commercial/sting | Narholz, Gregor F. | Commercial Length Cuts 11 | CLC-11 | |
| 15 | Tough Challenge | sting | Narholz, Gregor F. | Commercial Length Cuts 11 | CLC-11 | |
| 15 | Tough Challenge | sting | Reith, Dieter | Commercial Length Cuts 11 | CLC-11 | |
| 16 | Tough Challenge | rythmic_underscore/commercial | Narholz, Gregor F. | Commercial Length Cuts 11 | CLC-11 | |
| 16 | Tough Challenge | rythmic_underscore/commercial | Narholz, Gregor F. | Commercial Length Cuts 11 | CLC-11 | |
| 16 | Tough Challenge | rythmic_underscore/commercial/sting | Narholz, Gregor F. | Commercial Length Cuts 11 | CLC-11 | |
| 16 | Tough Challenge | rythmic_underscore/sting | Narholz, Gregor F. | Commercial Length Cuts 11 | CLC-11 |