As Texas Republicans move ahead with redistricting to protect or even expand the GOP’s slim majority in the US House, Democratic-run states, led by California, are pushing forward with their own efforts to draw new maps and add Democratic seats.

Democratic National Committee Chair Ken Martin urged members of his party to forget their usual rulebook and go all in on partisan redistricting Tuesday.

Dave’s Redistricting is a web app developed by Dave Bradlee, a software engineer, that allows users to draw imagined electoral districts. Hobbyists can combine the relaxation of paint-by-numbers with the catharsis of destroying their political opponents in a fantasised redistricting process.