New features Introduce 'gene splicing', i.e. the ability to cut together different realisations of the overdensity field. An accompanying paper will be posted to arXiv shortly (Cadiou, Pontzen, Peiris & Lucie-Smith 2021). Add ability to output multiple gadget files (essential for large ICs due to limitations of the gadget format) Bug fixes Addresses issue #90, where placement of zoom windows near the edge of the box could result in errors Addresses issue #85, where Zel'dovich displacement calculations could cause a bounds overrun error