How exactly Income Tax Dept is going to act against Bitcoins ?

1.Can someone throw light upon the exact legal remedy available to FinMin and IT Dept against Bitcoin and other crypto-currencies ?

2.If law doesn't recognize them as legal tender, how it is different from Game-Cureency (which is, as per my best knowledge, not yet taxable !) ?

3. If someone bought Bitcoin from his valid, shown-in-return savings, and doesn't realize the profit in Rupees or any legal tender - like keeping it invested in Cryptos themselves- how and under which section of which law FinMin and IT Dept are going to take actions against such portfolio ??