FPGA chips are very powerful, have a look at this FPGA video game implementation that used to require a custom board and complex circuitry to make work.
"The original Pac-man arcade game, implemented inside a single Xilinx Spartan-3E chip on a Spartan-3E Starter Kit. None of the extra hardware on the board is used, the chip in the middle implements the complete arcade board of the original game!"
http://hackedgadgets.com/2008/03/10/fpga-pac-man/
