Infinite lives - SXNGYLVG

Start with 1 life - PAOSOTLA

Start with 6 lives - TAOSOTLA

Start with 9 lives - PAOSOTLE

1 life after continue - PEVIULLA

6 lives after continue - TEVIULLA

9 lives after continue - PEVIULLE

Start with Machine Gun - PEKSOGZA

Start with Laser Gun - GEKSOGZA

Start with Homing Missiles - AEKSOGZE

Start with Grenade Launcher - AOKSOGZA

Start with Machine Gun & Laser Gun - IEKSOGZA

Protection against most aliens - OTUVOZSV

Some aliens are tougher - AAXTKAZE

Some aliens are weaker - PAXTKAZA

Mega-jump - TOOETOLA

Speed jump - AZVALPPA + EVNEYENY