Although it is very difficult to enter into the Rādhā-Kṛṣṇa pastimes, most of the devotees of Vṛndāvana are attracted to the rādhā-kṛṣṇa-līlā. However, since Nitāi-Gauracandra are direct incarnations of Balarāma and Kṛṣṇa, we can be directly in touch with Lord Balarāma and Lord Kṛṣṇa through Śrī Caitanya Mahāprabhu and Nityānanda Prabhu. Those who are highly elevated in Kṛṣṇa consciousness can enter into the pastimes of Rādhā-Kṛṣṇa through the mercy of Śrī Caitanya Mahāprabhu. It is said, śrī-kṛṣṇa-caitanya rādhā-kṛṣṇa nahe anya: ‘Śrī Kṛṣṇa Caitanya Mahāprabhu is a combination of Rādhā and Kṛṣṇa.’
(Caitanya-caritāmṛta Madhya 16.281, Purport)