This game crash on real ZX Spectrum 128 or +2. This ZX models use ULA contended(slow down) memory pages 1,3,5,7. If you move all game code to fast memory pages 0,2,4,6 then will game work.
Game use register I (IM2 table) set to #FE value and ZX Screen can rain(bug in ZX hardware). On real ZX128 nad +2 models can't be I register set out of range #80-#BF.
