Cleaning/restoring old wooden block/tiles on hall floor

[Ang44]

Hi - I have wooden tiles/blocks in my hallway which overlay the original pine floorboards. The tiles are 4.5 inches square and each tile is made up of 5 strips of wood. These tiles are laid alternately giving a parquet type effect. The tiles are 1cm in depth and appear to be glued down with something black. Apart from one edge - in a doorway, the tiles appear to be in good condition and well glued down. A few bits are coming loose in the doorway. My question is - is this floor worth keeping and if so, how should I go about restoring and cleaning it? Am not sure what the tiles are made of - possibly oak/some sort of hard wood? Am not sure of the finish - is slightly shiny.
Any help/ideas gratefully recieved!

 

[misterhelpful]

Remove the damaged blocks, clean the old adhesive away and re-stick with something like this:
http://www.sourcewoodfloors.co.uk/shop/sika-t2-cartridge.html

If the rest of the floor is in good condition, and depending on the size of area you could hire a floor/belt sander to remove the existing varnish. You can then re-finish with a couple of coats of a good quality floor stain/varnish and it will look like new.