Warhead only costs L19.99 due to the fact it's a 'standalone-expansion-pack.' For the uninitiated that means it'll follow on from Crysis through the questionably lazy method of an alternative story. Warhead is set on the same island, with the same graphics engine (aside from a few improvements and supposed optimisation), stars the same characters and therefore is fundamentally the same game. There's no need to own the original Crysis and no benefit from doing so (minus the obvious familiarity with story and location). At such a knockdown price, a simple question arises; why so cheap?