It is a smallish ballpit/indoor play area (like MAdhouse) DS had a party there (age 6). They have opened a new 3 tier one at same place called SPACE which DS wants to try before he is too big. It is great if you can leave them there for a party as not much room to sit & watch. South Reading Lesire Centre have a much bigger/better indooe plkay place as well.
i would say the one by the madejski stadium as the swamp was abit of a dump when we took the kids to it, unless it has been refitted since last year!
the one at south reading is ok, but i thought that it was aimed more at kids from about 3 1/2 especially as the cafetria area is upstairs!
there is a good area for younger children, although obviously i would recommend close supervision and to go when the older children are at school as it can get a bit rough in there with the older ones.
The SWAMP has a separate area just for the little ones where you can sit (it is upstairs). It is small but you can see the kids all the time & they can come & go to you as they please. I used to go there for a coffee when mine were that small. If they are not into climbing up all the large slides etc the SWAMP may be just fine.