function swapExits(stage, rom)
{
    if (stage.exits !== 2) return;
    console.log('swapping exits @ ' + stage.name);

    // secret exit triggers event+1
    var ndxa = rom[0x2D608 + stage.translevel];
    var ndxb = ndxa + 1, ndxc = ndxa + 2;

    // get offsets into the event data table
    var offseta = rom[0x26359 + ndxa * 2] | (rom[0x26359 + ndxa * 2 + 1] << 8);
    var offsetb = rom[0x26359 + ndxb * 2] | (rom[0x26359 + ndxb * 2 + 1] << 8);
    var offsetc = rom[0x26359 + ndxc * 2] | (rom[0x26359 + ndxc * 2 + 1] << 8);

    // get the size of each event
    var asz = offsetb - offseta;
    var bsz = offsetc - offsetb;

    // copy the event data to temporary storage
    var eventa = rom.slice(0x025D8D + offseta, 0x025D8D + offseta + asz);
    var eventb = rom.slice(0x025D8D + offsetb, 0x025D8D + offsetb + bsz);

    // update the new offset for where event+1 should go
    offsetb = offseta + bsz;

    // copy the event data back into the event table
    rom.set(eventb, 0x025D8D + offseta);
    rom.set(eventa, 0x025D8D + offsetb);

    // update the offset for event+1 back into the table
    rom.set([offsetb & 0xFF, (offsetb >> 8) & 0xFF], 0x26359 + ndxb * 2);
}