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a sledge giving them a love whack may loosen things up a bit first
When I did a floor that looks scarily exactly the same as your photo I found that helped. I just used a chisel and lump hammer for the rest and found for a lot of them you could get them with two hits if you hit them right (obvs some took forever to lift).
In the end it was pointless as the whole concrete floor was pulled and redone.
Also I know I said it in the homeowners thread, but that's the sort of job you'd smash through with a labourer helping you.
Thanks but I've got to finish today and all I have is an SDS drill and 75mm tile lifter attachment.
Just gonna have to flippin deal with it.