let mode_edit = new Mode('write ASCII char to map tile', false, false);
let mode_teleport = new Mode('teleport away?', true);
let mode_portal = new Mode('add portal to map tile', true, true);
let mode_edit = new Mode('write ASCII char to map tile', false, false);
let mode_teleport = new Mode('teleport away?', true);
let mode_portal = new Mode('add portal to map tile', true, true);