Experimental studies on gasification of wet biomass with mixtures of O2-CO2 in a packed bed counter-current configuration are described in this work. The primary focus is to quantify flame propagation rate, H2 yield, and CO yield. Wood chips with 29, 39, and 49 % moisture were used in the experiments. To explore the effects of O2 fraction in the oxidizer, experiments were conducted with 31.3 % to 42 % oxygen (by mass, rest CO2). Oxy-steam-CO2 experiments are also carried out to compare the performance of wet biomass experiments. The limits of moisture content, oxygen fraction, steam fraction employed in these experiments are determined by the steady propagation of the flame. The results indicate that H2 yield varies from 10-22 g/kg biomass in wet biomass and 16-38 g/kg biomass in steam cases. CO yield in the wet biomass case and the steam case is approximately the same (500 g/kg of biomass). The optimum condition is near the ‘volatile’ equivalence ratio of ~1.2-1.4. In the case of wet biomass, the maximum hydrogen yield is about 60% higher than the reference case (7.5% moisture, 23% O2, rest CO2). H2 yield obtained in the steam case is higher than the wet biomass case, which is expected due to the presence of high-temperature steam (120-150 oC). The trend observed from the results is irrespective of the moisture content and type of biomass used. The general behavior of increase in H2 and CO yields as the operating point is changed from rich towards volatiles stoichiometry followed by a decrease on the lean side is observed here as in the previous study. From the current study, it has been seen that wet biomass is a good substitute for bringing down the input cost and energy with an acceptable compromise in H2 yield.