Blaster bombs dont explode unless they actually hit something, what may be happening is that your first waypoint it actually hits something, they are slightly inaccurate so if you are firing from a height to floor level it may be slightly inaccurate and continue into the ground instead of flying just above the floor to the next waypoint.

Also you should use some slowdown utility if on geoscape when you scroll it starts moving really fast.

If its too fast for ya, try dosbox, and lower cycles, if needed

I see no point in time delaying grenades - if a grenade blast hits an unconscious alien, it will be automatically killed.

The demo charge can only destroy a ship's interior walls. Only blaster bombs can destroy the outer hull, and then only the square directly hit by the bomb.

Time delay grenades are pretty much useless, time-delay prox and smoke are more useful but still are not very effective.

The only advantage of having time-delay is that aliens cannot react on the turn you launch the grenade, if you throw a grenade where you think/know an alien is going to be next turn and toss a grenade for 1 turn delay, and when an alien hopefully moves near where the grenade is then instead of tossing a 0 delay grenade and getting hit by reaction fire you can just end the turn/ move other troopers around and end the turn and the grenade goes boom and alien (hopefully) goes boom as well. :blink:

Like I said though, pretty much useless.

@Rbell: You can't use High Explosives to blow up UFO walls(At least I've never had any information about a successful attempt). Only heavy plasma and Blasters break the walls down.
I mostly never time grenades... neither use high explosives
@Dstick: As Sharp said before Blasters(and all other weapons too) don't blow up unless something gets in their way. If u placed new waypoints, did u mean, that the game still allowed it to happen or it just didn't place them(that would be an odd variant)? Assuming the first version is right, then U just have to be more carefull while placing them to make sure, that anything doesn't get in the way.

There is a use for High Explosives - prime a few of them and put them in some rookies inventory. Next, walk into a room full of aliens and let them shoot your rookie. Instant human bomb! :evil:

Just like whats always on teh news, exept the news doesn't involve aliens :)

I need to know where it´s the alien control centre of the colony??? I attacked two of their colonies and i was always forced to killl all the defenders and it wasn´t cheaper(many loses in equipment and people)

Speaking bout bases... i play on the lowest dificulty and those bastards built at least 6 bases by now 1 in europe 3 in africa 1 on japan and 1 in the arctic.
ive already blasted the european one and arctic.

Anwser Its an 2x2 room with an large grav lift in the center.

How fun is to blow that Alien Centre, shoot with a Blaster (my favourite weapon) and BOOM ! How satisfied you are when you hear how those aliens fry in The command center...