Early versions of the NSP (v0) had crashing issues; v589824 is significantly more stable.
A 4chan user posted that typing the string as a Steam launch option ( +eastward 010071b00f63a800v589824usnsprar better ) unlocked a “Developer’s Trucks” secret level. This was debunked — Steam launch options do not parse spaces or hex. However, several users reported that adding -dev_override_hash=010071b00f63a800v589824usnsprar to the shortcut target actually improved load times on older GPUs. eastward 010071b00f63a800v589824usnsprar better