In Level 1, Stage 4, head all the way at the end in the first part of the level and walk into the dead end. After that, go all left until you will see a gap. Enter the bush with a black area to find the HAL room. In Level 6, Stage 5, in the 3rd room, go all the way at the end and fly up to the 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.