Left 4 Theft is a major/total modification for Grand Theft Auto: San Andreas. The mod is slightly based on Left 4 Dead and will bring you the zombie apocalypse in San Andreas. Fight off zombies, explore the infected world, join factions and a lot more!
At the end of each wave, in the survival mode, a sphere and map icon will appear. The player can enter the sphere to buy 'upgrades' and weapons. The player will receive $500 after completing a wave.
Looks good all, but I think it isn't sphere but circle :P
It's called a sphere in SCM, the GTA3-era script language so I guess it actually is a sphere :p