TEMU, a Game Boy emulator for the ZX Spectrum +2a/+3 capable only of running a Tetris ROM.
As far as CPU goes only 9 instructions had to be implemented via emulation, everything else is executed directly. The rest of the resources are spent emulating graphics and sound to the limited extent that Tetris is using them. Keep in mind that the Spectrum's CPU runs slower than that of the Game Boy. 3.5 Mhz vs 4.19 Mhz.
Bobinas P4G is a social network. It runs on GNU social, version 2.0.1-beta0, available under the GNU Affero General Public License.
All Bobinas P4G content and data are available under the Creative Commons Attribution 3.0 license.