Six toddlers in my home daycare, a week of rain, and I've run out of indoor ideas

From my ground-floor flat in Manikonda I run a small daycare, six children between one and a half and three. Normally we go to the society park morning and evening, but this week it has rained so much that we're inside the whole day, and by 11 they're climbing everything, including me. I don't put the TV on for them. So far we've done play dough, water play in tubs on the balcony, stacking steel dabbas, and dancing to old Hindi songs. All of it twice now. What do other daycare owners, or parents with more than one small child, do in a small space when it rains for days? Cheap things are best.