Kerbal Space Program puts you in charge of a fledgling space agency on the planet Kerbin, where you design, build, and fly rockets using realistic orbital mechanics. The game uses a simplified but accurate Newtonian physics model — you need to understand delta-v budgets, transfer orbits, and staging to reach other planets. With Career, Science, and Sandbox modes, KSP caters to both structured progression and creative engineering. The modding community adds thousands of parts, visual overhauls, and automation tools that extend the game indefinitely.
Choosing the right build shapes your entire experience. This guide breaks down every option — what they're good at, what they struggle with, and which one matches your playstyle. For optimized builds with full gear sets, see our builds guide.
Quick Comparison
| Build | Tier | Playstyle | Best Equipment | Beginner Friendly? |
|---|---|---|---|---|
| Pilot | S | Sits in the command pod providing stability assist during all maneuvers. | SRB Booster | Moderate |
| Engineer | A | Manages surface base operations, repairs equipment, and operates mining rigs. | Mainsail Engine | Yes |
| Scientist | A | Runs EVA experiments across biomes and processes data in orbital labs. | Nuclear Engine | Yes |
| Tourist | C | Sits passively while you fly them to their destination and back safely. | Ion Engine | No |
| Rescue Target | B | Fly to the stranded Kerbal, EVA them to your ship or dock, and return to Kerbin. | SAS Module | No |
New player? Start with Engineer — see our beginner's guide for why.
Pilot
Pilots provide SAS hold capabilities at various levels — Level 1 holds prograde/retrograde, Level 3 unlocks maneuver node hold, and Level 5 gives target hold. Without a pilot or probe core with SAS, you can't lock heading during burns. Essential for every crewed mission.
| Attribute | Detail |
|---|---|
| Tier | S |
| Playstyle | Sits in the command pod providing stability assist during all maneuvers. |
| Best Equipment | SRB Booster |
| Stat Priority | Experience Level (gained from reaching new celestial bodies) |
| Core Gear | Command Pod, SAS Module, Reaction Wheels |
| Key Mechanic | orbital mechanics |
Strengths
- Highest overall performance across all content types
- Sits in the command pod providing stability assist during all maneuvers.
- Pairs well with SRB Booster
Weaknesses
- Popular choice, competition for resources
- Needs specific gear to reach full potential
Recommended Progression
- Start in Kerbin to learn Pilot-specific mechanics
- Focus on orbital mechanics — it's this build's primary system
- Prioritize SRB Booster as your first major upgrade
- See our full Pilot build guide for the optimal gear progression
Engineer
Engineers repack parachutes, repair wheels and landing legs, and boost ISRU drill and converter efficiency. A Level 3 Engineer makes mining operations viable by increasing ore extraction rates. Essential for self-sustaining bases on other planets.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Manages surface base operations, repairs equipment, and operates mining rigs. |
| Best Equipment | Mainsail Engine |
| Stat Priority | Experience Level for ISRU efficiency bonuses |
| Core Gear | ISRU Converter, Drill, Landing Legs, Parachutes |
| Key Mechanic | staging |
Strengths
- Most versatile — adapts to any situation
- Manages surface base operations, repairs equipment, and operates mining rigs.
- Pairs well with Mainsail Engine
Weaknesses
- Lower peak damage than S-tier options
- Needs specific gear to reach full potential
Recommended Progression
- Start in Kerbin to learn Engineer-specific mechanics
- Focus on staging — it's this build's primary system
- Prioritize Mainsail Engine as your first major upgrade
- See our full Engineer build guide for the optimal gear progression
Scientist
Scientists can reset experiment modules (like Mystery Goo and Science Jr.) for reuse without returning to Kerbin. They also boost lab processing speed in the Mobile Processing Lab. A Level 5 Scientist can reset every experiment, making multi-biome missions far more efficient.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Runs EVA experiments across biomes and processes data in orbital labs. |
| Best Equipment | Nuclear Engine |
| Stat Priority | Experience Level for experiment reset capability |
| Core Gear | Mobile Processing Lab, Science experiments, EVA equipment |
| Key Mechanic | delta-v budgets |
Strengths
- Best survivability for learning hard content
- Runs EVA experiments across biomes and processes data in orbital labs.
- Pairs well with Nuclear Engine
Weaknesses
- Slower progression speed
- Needs specific gear to reach full potential
Recommended Progression
- Start in Kerbin to learn Scientist-specific mechanics
- Focus on delta-v budgets — it's this build's primary system
- Prioritize Nuclear Engine as your first major upgrade
- See our full Scientist build guide for the optimal gear progression
Tourist
Tourists are contract-generated passengers who can't perform any actions — they just need to visit specified destinations. Tourist contracts pay well but add dead weight to your craft. Useful only for income in Career mode.
| Attribute | Detail |
|---|---|
| Tier | C |
| Playstyle | Sits passively while you fly them to their destination and back safely. |
| Best Equipment | Ion Engine |
| Stat Priority | None — tourists have no skills |
| Core Gear | Extra seats in command pods, passenger cabins |
| Key Mechanic | docking |
Strengths
- Excellent in group and cooperative content
- Sits passively while you fly them to their destination and back safely.
- Pairs well with Ion Engine
Weaknesses
- Less effective solo
- Requires deep game knowledge to use effectively
Recommended Progression
- Start in Kerbin to learn Tourist-specific mechanics
- Focus on docking — it's this build's primary system
- Prioritize Ion Engine as your first major upgrade
- See our full Tourist build guide for the optimal gear progression
Rescue Target
Rescue contracts place stranded Kerbals in orbit or on surfaces that you must retrieve. Successfully rescued Kerbals join your roster permanently. These missions teach rendezvous and docking skills, and rescued Kerbals often come with experience.
| Attribute | Detail |
|---|---|
| Tier | B |
| Playstyle | Fly to the stranded Kerbal, EVA them to your ship or dock, and return to Kerbin. |
| Best Equipment | SAS Module |
| Stat Priority | Pilot skill for rendezvous maneuvers |
| Core Gear | Extra command seat or docking port, rendezvous-capable craft |
| Key Mechanic | science collection |
Strengths
- Highest skill ceiling with unique mechanics
- Fly to the stranded Kerbal, EVA them to your ship or dock, and return to Kerbin.
- Pairs well with SAS Module
Weaknesses
- Steep learning curve, punishing mistakes
- Requires deep game knowledge to use effectively
Recommended Progression
- Start in Kerbin to learn Rescue Target-specific mechanics
- Focus on science collection — it's this build's primary system
- Prioritize SAS Module as your first major upgrade
- See our full Rescue Target build guide for the optimal gear progression
Which Build Should You Pick?
For Beginners
Engineer is the clear winner. It's forgiving, teaches core mechanics, and remains competitive into endgame. Follow our beginner's guide for the best first-session experience.
For Maximum Performance
Pilot is the top pick once you understand the game's mechanics. Pair it with SRB Booster for the strongest overall setup.
For a Challenge
Rescue Target offers the highest skill ceiling. It's punishing when misplayed but incredibly rewarding when mastered. Only recommended after you've completed the game with another build.
For Group Play
Tourist shines in cooperative content with utility and team support capabilities.
More Kerbal Space Program Guides
- Kerbal Space Program Kerbal Space Program Overview
- Kerbal Space Program Best Builds
- Kerbal Space Program Tier List
- Kerbal Space Program Walkthrough
- Kerbal Space Program Beginner's Guide
- Kerbal Space Program Tips & Tricks
- Kerbal Space Program Weapons Guide
- Kerbal Space Program Combat Guide
- Kerbal Space Program Boss Guide
- Kerbal Space Program Maps & Locations
- Kerbal Space Program Crafting Guide
Similar Games
If you enjoy Kerbal Space Program, check out these related guides:
- Stardew Valley Classes Guide — simulation game with similar mechanics
- Satisfactory Classes Guide — simulation game with similar mechanics
- The Sims 4 Classes Guide — simulation game with similar mechanics
