What changed in Kerbal Space Program in 2013

A hybrid propulsion system that uses external intake air in the atmosphere and switches to internal oxidizer supply in space.

Significant optimizations to improve game efficiency, especially with high part counts.

Kerbals on EVA can now collect and store data from experiment modules and other science containers.

Several parts can now be tweaked individually by right-clicking them during construction.

Experiments are now performed, stored, and transmitted in a more engaging way, eliminating endlessly-repeatable transmissions.

The tooltips for part icons have been redesigned for better organization and readability.

The tooltips for part icons have been completely overhauled for better organization and readability.

A hybrid propulsion system that uses external intake air and switches to internal oxidizer supply in space.

Support for 6-degrees-of-freedom input devices like the Space Navigator for enhanced control.

Support for 6-degrees-of-freedom input devices for enhanced camera control and flight control.

Browse through all the science you've done in your Career games in this new section of the R&D Facility.

Browse through all the science you've done in your Career games in this new section of the R&D Facility.

Kerbals on EVA can now collect and store data from experiment modules and other science containers.

The Lab Module allows processing of science data on the field and resetting single-use modules.

The Lab Module allows processing of science data on the field and resetting single-use modules.

Optimizations focused on reducing lag with high part counts for smoother gameplay.

Experiments are now performed, stored, and transmitted in a more engaging way, eliminating endlessly-repeatable transmissions.

Several parts can now be tweaked individually by right-clicking them during construction.

The KSP Launcher now includes a news feed and allows users to tweak game settings before launching.

The app config has been reverted to prevent the launcher from opening automatically due to issues on OSX, Linux, and with the Steam Overlay.

New settings available in the Advanced Tab of the launcher, including frameless windowed mode.

The app config has been reverted to prevent the launcher from opening automatically due to issues on OSX, Linux, and with the Steam Overlay.

New settings available from the launcher include options like frameless windowed mode.

The KSP Launcher now includes a news feed for quick access to the latest news and dev blogs, and allows tweaking of game settings before launching.

Antenna can transmit science data but consume significant power.

Features news bulletin, patcher management, and external settings tweaking.

Improved stability based on player feedback.

Recover a flight after landing/splashdown without going through the Tracking Station.

Career Mode is now open for new saves, although still under development.

Players can now recover a flight after landing without using the Tracking Station.

The SAS system has been improved for better stability.

Celestial bodies now support Biome Maps for varied experiment conditions.

Facilities feature new ground meshes and graphical improvements.

Added a new music track for the Research & Development Facility.

Greatly improved visuals and functionality.

Landing legs and gears now feature proper shock-absorbing suspensions.

New system to save and load subsets of spacecraft for reuse.

Nose Cones now enhance stability during atmospheric flight.

Career Mode is now open for new saves, still under development.

Earn Science by performing experiments, collect surface samples, and process them.

New ground meshes and graphical improvements to KSC Facilities.

Biomes implemented on Kerbin and the Mun for varied experiment conditions.

New system allows saving and loading of spacecraft subsets for reuse.

Added a new music track for the R&D Facility.

Features news bulletin, patcher management, and settings tweaks from outside the game.

New mesh for the Comms Dish, maintaining original placement rules.

Antenna can now transmit science data back to Kerbin, consuming power.

New mesh with unchanged placement rules.

Players can unlock parts by researching nodes on the Tech Tree in Career Mode.

Includes Materials Bay and Mystery Goo™ Canister, with experiments for existing parts.

Earn Science by performing experiments; collect surface samples on EVA.

Includes Materials Bay and Mystery Goo™ Canister, with experiments for existing parts.

New facility allows players to unlock parts by researching nodes on the Tech Tree.

Nose Cones now enhance stability during atmospheric flight.

Now feature proper shock-absorbing suspensions.

Greatly improved Island Airfield with new lighting effects.

Resolved an issue where players could get stuck in the Editor scenes due to unresponsive buttons.

Corrected an issue with the new SAS that wasn't holding attitude as intended.

Resolved an issue that caused lag while moving parts around if too many crews were hired.

Improved the logic for SAS attitude hold to prevent drifting off target.

Adjusted parameters on the SAS to enhance its responsiveness.

Cleaned up the game by removing some unused assets.

All command pods now enable SAS for the vessel, though not all can apply torque.

All command pods now enable SAS for the vessel, though not all can apply torque.

Addressed an issue that caused parts of the UI to become unresponsive in the VAB and SPH.

Improved the logic for SAS attitude hold to prevent drifting off target.

Resolved lag issues that occurred while moving parts around the editor scenes with too many hired crews.

Adjusted the ocean color at sea level to be less dark.

Resolved a critical issue where players could get stuck in the Editor scenes.

Adjusted parameters on the SAS to enhance its responsiveness.

Corrected the issue with the new SAS that wasn't holding attitude properly.

Addressed an issue with scenery meshes causing UI elements to become unresponsive.

Modified the ocean color at sea level to be less dark.

Redesigned the way flights are ended, removing the 'End Flight' button to prevent accidental deletions.

New building at the Space Center for managing and recruiting astronauts.

Rebuilt Stability Augmentation System for improved flight stability.

Redesigned the way flights are ended, removing the 'End Flight' button to prevent accidental deletions.

New version incompatible with old save files, but a system for upgrading them is now available.

New procedurally generated craters and terrain optimizations for a more interesting landscape.

New building at the Space Center for managing and recruiting astronauts.

Launch of a new website for the game.

Major code overhaul for better resource management and scene transitions.

New version incompatible with previous SFS save files, but upgrade system available.

Various bug fixes and tweaks included in the update.

Ability to select and assign crew members to vessels before launch.

Overhauled Space Center with new models for nearly all facilities and added new ones.

Overhauled Space Center with new models for nearly all facilities and added new ones.

New procedurally generated craters and terrain optimizations for a more interesting landscape.

Completely rebuilt Stability Augmentation System for improved flight stability.

Major code overhaul for better scene transitions and resource management.

Ability to select crew for vessels before launch from a list of available crewmembers.

Launch of a new website for the game.

Completely redesigned interiors of construction facilities with improved models.

Completely redesigned interiors of construction facilities with improved models.

Mouse wheel now works as intended for zooming and scrolling in various views.

Resolved high memory usage when loading png and jpeg textures.

Mouse wheel now works as intended for zooming and scrolling in various dialogs.

Resolved high memory usage when loading png and jpeg textures.

Fixed the screen resolution not being properly applied on game start.

Fixed a serious issue with the Cupola Pod that could cause spontaneous vessel disassembly.

Fixed the screen resolution not being properly applied on game start.

Fixed situations where the 'Control From Here' selection would be lost on resuming a game save.

Landmarks and bases should no longer spawn below ground.

Tweaked the logic for part-to-part collisions to reduce explosions on contact.

Fixed a serious issue with the Cupola Pod that could cause spontaneous unplanned vessel disassembly.

Fixed the scale of Gilly in the Tracking Station scene.

Tweaked part components on EVA to start with the correct values.

Fixed an issue that caused internal spaces to spawn in duplicate, wasting resources.

Fixed situations where the 'Control From Here' selection would be lost on resuming a game save.

Fixed the camera jitter when walking around on EVA.

Adjusted suspension on Medium Rover Wheels to eliminate jittering.

Tweaked part components on EVA to start with the correct values.

Fixed a few issues with flags behaving strangely after being toppled down.

Fixed the scale of Gilly in the Tracking Station scene.

Landmarks and bases should no longer spawn below ground.

Tweaked the logic for part-to-part collisions to reduce explosions on contact.

Fixed the too-low resolution on planetary diffuse and normal maps.

Fixed an issue that caused internal spaces to spawn in duplicate, wasting resources.

Tweaked the suspension on the new Medium Rover Wheels to fix jittering.

Fixed the too-low resolution on planetary diffuse and normal maps.

Fixed camera jitter when walking around on EVA.

Fixed issues with flags behaving weirdly after being toppled down.

Includes a Cupola with IVA, Small Lander with IVA, 2 new Probe cores, a new large docking clamp, a new Medium wheel, and attachable command seats for kerbals.

Kerbals on Eva can plant flags with editable plaques, with 23 stock flags available and the option to create custom flags.

Includes a Cupola with IVA, Small Lander with IVA, 2 new Probe cores, a new large docking clamp, a new Medium wheel, and attachable command seats for kerbals.

Includes vessel filtering for the tracking station, a Kerbal Knowledge base, upgraded scene loader, and a 30% average reduction in memory usage.

Added flag interface to editor, removed requirement to start with a command pod, and allowed deletion or replacement of the first part of a ship.

Kerbals on Eva can plant flags with editable plaques, featuring 23 stock flags and the ability to create custom flags.

Includes vessel filtering for the tracking station, a Kerbal knowledge base, upgraded scene loader, and improved memory usage by approximately 30%.

Added Flag interface to editor, removed requirement to start with a command pod, and allowed deletion or replacement of the first part of a ship.

Numerous bugs have been squashed to improve gameplay.

Numerous bugs have been squashed to improve overall game performance.