From Kerbal Space Program Wiki
There have been three stock gameplay modes since 0.25.
A table for a brief comparison
| Financial system
(strategies, contracts and cost of parts)
| Scientific development
(tech tree and science)
| KSC development
(upgradeable buildings in the KSC )
| Kerbal development
(experience system and specializations)
This category has only the following subcategory.
- [+] Career-specific features (1 C, 24 P)