In Level 1, Stage 4, go all the way at the end in the first part of the level and walk into the dead end and go all left until you will see a gap and go into the bush with a black area, and you will find the HAL room. In In Level 6, Stage 5, in the 3rd room, go all the way at the end and fly up to those conveyor belts and go into that black area at the top of the conveyor belt. You will go into the cannon room and it will shoot you, and you will see the HAL blocks.