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Is it still worth playing?
Squad's space flight simulation, built in Unity, first released publicly in 2011 and in full as version 1.0 in 2015. You build rockets, aircraft, spaceplanes and rovers from parts and launch them, with maneuver nodes, rendezvous and docking supported, and Kerbals can go on EVA, collect science, plant flags and repair craft. Physics uses a patched conic approximation rather than a full simulation of every body, and its planets are loose analogues of real Solar System bodies. There are three modes: Sandbox with all parts, Science where experiments unlock parts, and Career with funds, reputation and contracts. In sandbox mode, with no real penalty for failure, experimenting with a craft still stays fun today.